MARSHALL & ILSLEY CORP/WI/
424B3, 1994-01-05
NATIONAL COMMERCIAL BANKS
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<PAGE>   1
 
                       [Valley Bancorporation Letterhead]
 
                                                               December 30, 1993
 
Dear Shareholder:
 
     You are cordially invited to attend a special meeting of the shareholders
of Valley Bancorporation to be held at the Paper Valley Hotel and Conference
Center, 333 West College Avenue, Appleton, Wisconsin, at 10:00 a.m., local time,
on Tuesday, February 15, 1994.
 
     The purpose of the meeting is to vote on a proposal to approve the
Agreement and Plan of Merger whereby Valley Bancorporation would be merged with
and into Marshall & Ilsley Corporation. The Agreement and Plan of Merger
provides for the conversion of each outstanding share of Valley Bancorporation
common stock into 1.72 shares of Marshall & Ilsley Corporation common stock. The
proposed merger requires regulatory approvals and the approval of the Agreement
and Plan of Merger by the holders of a majority of the outstanding shares of
common stock of Valley Bancorporation and of Marshall & Ilsley Corporation.
Marshall & Ilsley Corporation shareholders will consider approval of the
Agreement and Plan of Merger at their separate meeting also to be held on
February 15, 1994.
 
     The Board of Directors of Valley Bancorporation believes that the merger is
in the best interests of Valley Bancorporation and its shareholders and
unanimously recommends that you vote FOR the approval of the Agreement and Plan
of Merger and the transactions contemplated thereby. The merger will unite two
institutions with complementary business strengths and operating philosophies to
create a combined institution with greater financial and managerial resources to
compete effectively in the rapidly changing marketplace for banking and
financial services. The enclosed Joint Proxy Statement-Prospectus explains in
detail the proposed merger. Please carefully review and consider all of this
information.
 
     It is especially important that your shares be represented and voted at the
meeting. Although you may currently plan to attend the meeting, please complete,
sign, date and promptly return the enclosed proxy card. If you attend the
meeting, you may still vote in person even if you previously returned your proxy
card.
 
                                          Sincerely yours,
 
                                          Peter M. Platten, III
                                          President and Chief Executive Officer
<PAGE>   2
 
                             VALLEY BANCORPORATION
                            100 WEST LAWRENCE STREET
                           APPLETON, WISCONSIN 54911
 
                         ------------------------------
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
 
                               February 15, 1994
 
To the Shareholders of Valley Bancorporation:
 
     Notice is hereby given that a Special Meeting of Shareholders of Valley
Bancorporation ("Valley") will be held at the Paper Valley Hotel and Conference
Center, 333 West College Avenue, Appleton, Wisconsin, on Tuesday, February 15,
1994 at 10:00 a.m., local time, for the following purposes:
 
          (1) To consider and act upon a proposal to approve the Agreement and
     Plan of Merger dated as of September 19, 1993 between Valley and Marshall &
     Ilsley Corporation ("M&I"), a copy of which is attached as Appendix A to
     the accompanying Joint Proxy Statement-Prospectus, providing for the merger
     of Valley with and into M&I pursuant to which each outstanding share of
     Common Stock, par value $.50, of Valley will be converted into 1.72 shares
     of Common Stock, par value $1.00, of M&I; and
 
          (2) To transact such other business as may properly come before the
     Special Meeting or any adjournment thereof.
 
     Shareholders of record at the close of business on December 20, 1993 will
be entitled to notice of and to vote at, the Special Meeting and any adjournment
thereof.
 
     THE AFFIRMATIVE VOTE OF THE HOLDERS OF A MAJORITY OF THE OUTSTANDING SHARES
OF COMMON STOCK ENTITLED TO VOTE IS NECESSARY TO APPROVE THE AGREEMENT AND PLAN
OF MERGER. THEREFORE, SHAREHOLDERS ARE REQUESTED TO DATE, SIGN AND RETURN THE
ACCOMPANYING PROXY IN THE ENCLOSED ENVELOPE WHETHER OR NOT THEY EXPECT TO ATTEND
THE SPECIAL MEETING IN PERSON. IF YOU ATTEND THE SPECIAL MEETING AND WISH TO
VOTE YOUR SHARES IN PERSON, YOU MAY DO SO BY REVOKING YOUR PROXY AT ANY TIME
PRIOR TO THE VOTING THEREOF.
 
                                            By Order of the Board of Directors,
 
                                            Gary A. Lichtenberg, Secretary
December 30, 1993
<PAGE>   3
 
                         MARSHALL & ILSLEY CORPORATION
                                      AND
                             VALLEY BANCORPORATION
                             JOINT PROXY STATEMENT
 
                         ------------------------------
 
                         MARSHALL & ILSLEY CORPORATION
 
                                   PROSPECTUS
 
     This Joint Proxy Statement-Prospectus is being furnished to the
shareholders of Marshall & Ilsley Corporation, a Wisconsin corporation ("M&I"),
in connection with the solicitation of proxies by the Board of Directors of M&I
for use at the Special Meeting of shareholders of M&I to be held on February 15,
1994, including any adjournment or postponement thereof (the "M&I Special
Meeting"). This Joint Proxy Statement-Prospectus is first being mailed to M&I
shareholders on or about December 30, 1993.
 
     This Joint Proxy Statement-Prospectus is also being furnished to the
shareholders of Valley Bancorporation, a Wisconsin corporation ("Valley"), in
connection with the solicitation of proxies by the Board of Directors of Valley
for use at the Special Meeting of shareholders of Valley to be held on February
15, 1994, including any adjournment or postponement thereof (the "Valley Special
Meeting"). This Joint Proxy Statement-Prospectus is first being mailed to Valley
shareholders on or about December 30, 1993.
 
     At the M&I Special Meeting and the Valley Special Meeting (together, the
"Special Meetings"), shareholders of M&I and Valley, respectively, will vote
upon a proposal to approve the Agreement and Plan of Merger, dated as of
September 19, 1993, between M&I and Valley (the "Merger Agreement"), pursuant to
which, among other things, Valley would be merged with and into M&I (the
"Merger"). In addition, at the M&I Special Meeting, shareholders of M&I will
vote upon proposals to amend M&I's Restated Articles of Incorporation, as
amended (the "M&I Articles"), and to approve the Marshall & Ilsley Corporation
1993 Executive Stock Option Plan ("1993 Stock Option Plan").
 
     This Joint Proxy Statement-Prospectus also constitutes the Prospectus of
M&I with respect to up to 37,188,021 shares of M&I common stock, $1.00 par value
(the "M&I Common Stock"), to be issued in the Merger. Upon consummation of the
Merger, each then outstanding share of Valley common stock, $.50 par value (the
"Valley Common Stock"), including rights appertaining thereto, will be converted
into 1.72 shares of M&I Common Stock, except as described herein.
 
     M&I Common Stock is quoted under the symbol "MRIS" on the National
Association of Securities Dealers Automated Quotations-National Market System
("NASDAQ/NMS").
 
                         ------------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR BY ANY STATE SECURITIES COMMISSION NOR HAS THE
   SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
    PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
     REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                         ------------------------------
 
THE SHARES OF M&I COMMON STOCK OFFERED HEREBY ARE NOT DEPOSITS OR SAVINGS
  ACCOUNTS AND ARE NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION
    OR ANY OTHER GOVERNMENTAL AGENCY OR INSTRUMENTALITY.
                         ------------------------------
 
    THE DATE OF THIS JOINT PROXY STATEMENT-PROSPECTUS IS DECEMBER 30, 1993.
<PAGE>   4
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                         PAGE
                                                                                         ----
<S>                                                                                      <C>
AVAILABLE INFORMATION.................................................................     1
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE.......................................     1
SUMMARY...............................................................................     3
  The Companies.......................................................................     3
  The Special Meetings................................................................     3
  The Merger..........................................................................     4
  Recommendations of the Boards of Directors and Reasons for the Merger...............     4
  Opinion of Financial Advisors.......................................................     5
  Conditions; Termination; Amendment..................................................     5
  Regulatory Approvals................................................................     6
  Accounting Treatment................................................................     6
  Certain Federal Income Tax Consequences.............................................     6
  Interests of Certain Persons in the Merger..........................................     7
  Stock Option Agreement..............................................................     7
  No Appraisal or Dissenters' Rights..................................................     8
  Comparative Stock Prices............................................................     8
  Selected Historical and Pro Forma Financial Data....................................     8
  Comparative Per Share Data (Unaudited)..............................................    12
THE SPECIAL MEETINGS..................................................................    13
  General.............................................................................    13
  Proposals to be Considered..........................................................    13
  Record Dates and Voting Rights......................................................    13
  Voting; Revocation of Proxies.......................................................    14
  Solicitation of Proxies.............................................................    15
THE MERGER............................................................................    15
  General.............................................................................    15
  Background of the Merger............................................................    15
  Reasons for the Merger and Recommendations of Boards of Directors...................    17
  Opinions of Financial Advisors......................................................    20
  Merger Consideration................................................................    30
  Effective Time......................................................................    30
  Conversion of Shares; Exchange of Certificates; No Fractional Shares................    30
  Representations and Warranties......................................................    32
  Conditions to the Merger............................................................    33
  Termination; Amendment and Waiver...................................................    34
  Conduct of Business Pending Merger..................................................    35
  No Solicitation of Transactions.....................................................    37
  Stock Option Agreement..............................................................    37
  Management and Operations After the Merger..........................................    39
  Interests of Certain Persons in the Merger..........................................    40
  Effect on Employee Benefits and Stock Options.......................................    41
  Accounting Treatment................................................................    41
  Certain Federal Income Tax Consequences.............................................    42
  Resale of M&I Common Stock by Affiliates............................................    42
  No Appraisal or Dissenters' Rights..................................................    43
CERTAIN RELATED TRANSACTIONS..........................................................    43
  Valley Rights Agreement Amendment...................................................    43
  Employment Agreements and Related Matters...........................................    43
</TABLE>
 
                                        i
<PAGE>   5
 
<TABLE>
<CAPTION>
                                                                                         PAGE
                                                                                         ----
<S>                                                                                       <C>
CERTAIN REGULATORY CONSIDERATIONS.....................................................    46
  Federal Reserve Board Approval......................................................    46
  OTS Approval........................................................................    47
PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS.....................................    47
AMENDMENT TO M&I ARTICLES OF INCORPORATION............................................    55
DESCRIPTION OF M&I CAPITAL STOCK......................................................    56
  In General..........................................................................    56
  M&I Common Stock....................................................................    56
  M&I Preferred Stock.................................................................    57
  M&I Series A Preferred Stock........................................................    57
  Certain Provisions of the Wisconsin Business Corporation Law........................    58
COMPARISON OF SHAREHOLDER RIGHTS......................................................    59
  Authorized Capital Stock............................................................    59
  Required Vote.......................................................................    59
  Size and Classification of Board of Directors.......................................    60
  Removal of Directors For "Cause"....................................................    60
  Newly Created Directorships and Vacancies on the Board of Directors.................    60
  Advance Notice of Proposals to be Brought at the Annual Meeting.....................    61
  Advance Notice of Nominations of Directors..........................................    61
  Certain Business Combinations.......................................................    61
  Shareholder Rights Plan.............................................................    62
  Anti-Takeover Effect of Certain Provisions..........................................    62
1993 EXECUTIVE STOCK OPTION PLAN......................................................    64
  General.............................................................................    64
  M&I Common Stock Subject to the 1993 Stock Option Plan..............................    64
  Administration......................................................................    64
  Eligibility.........................................................................    65
  Options to be Granted Under the 1993 Stock Option Plan..............................    65
  General Conditions; Termination of Employment.......................................    66
  Terms and Conditions of Non-Qualified Stock Options.................................    67
  Terms and Conditions of Incentive Stock Options.....................................    67
  Adjustment in Event of Capital Changes..............................................    67
  Duration and Amendment of the 1993 Stock Option Plan................................    68
  Accounting Treatment of Options.....................................................    68
  Tax Status of Options...............................................................    68
CERTAIN INFORMATION CONCERNING M&I AND VALLEY.........................................    69
EXPERTS...............................................................................    70
LEGAL OPINIONS........................................................................    70
SHAREHOLDER PROPOSALS.................................................................    71
APPENDIX A -- Agreement and Plan of Merger............................................   A-1
APPENDIX B -- Stock Option Agreement..................................................   B-1
APPENDIX C -- Proposed Amendment to Marshall & Ilsley Corporation Restated Articles
              of Incorporation........................................................   C-1
APPENDIX D -- Opinion of Salomon Brothers Inc ........................................   D-1
APPENDIX E -- Opinion of Keefe, Bruyette & Woods, Inc.................................   E-1
APPENDIX F -- Marshall & Ilsley Corporation 1993 Executive Stock Option Plan..........   F-1
</TABLE>
 
                                       ii
<PAGE>   6
 
     NO PERSONS HAVE BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS JOINT PROXY
STATEMENT-PROSPECTUS IN CONNECTION WITH THE SOLICITATION OF PROXIES OR THE
OFFERING OF SECURITIES MADE HEREBY AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY M&I OR
VALLEY. THIS JOINT PROXY STATEMENT-PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO
SELL, OR A SOLICITATION OF AN OFFER TO BUY, ANY SECURITIES, OR THE SOLICITATION
OF A PROXY, IN ANY JURISDICTION TO OR FROM ANY PERSON TO WHOM IT IS NOT LAWFUL
TO MAKE ANY SUCH OFFER OR SOLICITATION IN SUCH JURISDICTION.
 
                             AVAILABLE INFORMATION
 
     Each of M&I and Valley is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and, in
accordance therewith, files reports, proxy statements and other information with
the Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information can be inspected and copied at the public
reference room of the Commission at 450 Fifth Street, N.W., Washington, D.C.
20549 and at the Commission's Regional Offices in New York, Seven World Trade
Center, 13th Floor, New York, New York 10048, and Chicago, CitiCorp Center, 500
West Madison Street, Suite 1400, Chicago, Illinois 60621, and copies of such
material can be obtained by mail from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed
rates.
 
     M&I has filed a Registration Statement on Form S-4 (together with any
amendments thereto, the "Registration Statement") under the Securities Act of
1933, as amended (the "Securities Act"), with the Commission covering the shares
of M&I Common Stock to be issued in connection with the Merger. As permitted by
the rules and regulations of the Commission, this Joint Proxy
Statement-Prospectus omits certain information, exhibits and undertakings
contained in the Registration Statement. For further information pertaining to
the securities offered hereby, reference is made to the Registration Statement,
including the exhibits filed as a part thereof. Statements contained in this
Joint Proxy Statement-Prospectus or in any document incorporated by reference
herein as to the contents of any contract or other document are not necessarily
complete and, in each instance where such contract or document is an exhibit to
the Registration Statement or an incorporated document, reference is made to the
copy of such contract or document filed as an exhibit to the Registration
Statement or such incorporated document, each such statement being qualified in
all respects by such reference.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents filed by M&I (File No. 0-1220) with the Commission
pursuant to the Exchange Act are hereby incorporated by reference in this Joint
Proxy Statement-Prospectus:
 
          (1) M&I's Annual Report on Form 10-K for the year ended December 31,
     1992.
 
          (2) M&I's Quarterly Reports on Form 10-Q for the quarters ended March
     31, June 30 and September 30, 1993.
 
          (3) M&I's Report on Form 10-C dated May 28, 1993.
 
          (4) M&I's Current Report on Form 8-K dated September 19, 1993 (as
     amended by M&I's Current Report on Form 8-K/A dated September 19, 1993).
 
          (5) The description of the M&I Common Stock contained in M&I's
     registration statement filed pursuant to Section 12(g) of the Exchange Act,
     any amendment or report filed for the purpose of updating such description,
     and as amended by the description of the M&I Common Stock contained herein.
     See "DESCRIPTION OF M&I CAPITAL STOCK."
 
                                        1
<PAGE>   7
 
     The following documents filed by Valley (File No. 0-2453) with the
Commission pursuant to the Exchange Act are hereby incorporated by reference in
this Joint Proxy Statement-Prospectus:
 
          (1) Valley's Annual Report on Form 10-K for the year ended December
     31, 1992 (as amended by Amendment No. 1 thereto on Form 10-K/A dated June
     23, 1993).
 
          (2) Valley's Quarterly Reports on Form 10-Q for the quarters ended
     March 31, June 30 and September 30, 1993.
 
          (3) Valley's Report on Form 10-C dated August 27, 1993.
 
          (4) Valley's Current Report on Form 8-K dated September 19, 1993.
 
     All documents filed by M&I and Valley pursuant to Sections 13(a), 13(c), 14
and 15(d) of the Exchange Act subsequent to the date of this Joint Proxy
Statement-Prospectus and prior to the dates of the respective Special Meetings
shall be deemed to be incorporated by reference into this Joint Proxy Statement-
Prospectus from the dates of filing of such documents. Any statement contained
in a document incorporated or deemed to be incorporated in this Joint Proxy
Statement-Prospectus shall be deemed to be modified or superseded for purposes
of this Joint Proxy Statement-Prospectus to the extent that a statement
contained herein or in any other subsequently filed document which also is or is
deemed to be incorporated by reference modifies or supersedes such statement.
Any statement so modified or superseded shall not be deemed, except as so
modified or superseded, to constitute a part of this Joint Proxy
Statement-Prospectus.
 
     THIS JOINT PROXY STATEMENT-PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE
WHICH ARE NOT PRESENTED HEREIN OR DELIVERED HEREWITH. THESE DOCUMENTS (EXCLUDING
EXHIBITS UNLESS SUCH EXHIBITS ARE SPECIFICALLY INCORPORATED BY REFERENCE INTO
THE INFORMATION INCORPORATED HEREIN) ARE AVAILABLE WITHOUT CHARGE TO EACH
PERSON, INCLUDING ANY BENEFICIAL OWNER, TO WHOM A JOINT PROXY
STATEMENT-PROSPECTUS IS DELIVERED, UPON ORAL OR WRITTEN REQUEST OF ANY SUCH
PERSON. WITH RESPECT TO M&I'S DOCUMENTS, REQUESTS SHOULD BE DIRECTED TO
SECRETARY, MARSHALL & ILSLEY CORPORATION, 770 NORTH WATER STREET, MILWAUKEE,
WISCONSIN 53202 (TELEPHONE: (414) 765-7801). WITH RESPECT TO VALLEY'S DOCUMENTS,
REQUESTS SHOULD BE DIRECTED TO SECRETARY, VALLEY BANCORPORATION, 100 W. LAWRENCE
STREET, APPLETON, WISCONSIN 54911 (TELEPHONE: (414) 738-3836). IN ORDER TO
ENSURE TIMELY DELIVERY OF THE DOCUMENTS IN ADVANCE OF THE SPECIAL MEETINGS, ANY
SUCH REQUEST SHOULD BE MADE BY FEBRUARY 8, 1994.
 
     All information contained in this Joint Proxy Statement-Prospectus relating
to M&I has been supplied by M&I and all information relating to Valley has been
supplied by Valley.
 
                                        2
<PAGE>   8
 
                                    SUMMARY
 
     The following is a summary of certain information contained elsewhere in
the Joint Proxy Statement-Prospectus. This Summary is not intended to be
complete and is qualified in its entirety by reference to the more detailed
information contained elsewhere in this Joint Proxy Statement-Prospectus, the
attached appendices and the documents incorporated herein. Unless otherwise
indicated herein, M&I historical per share data has been retroactively restated
for the 3 for 1 stock split effected in the form of a 200% stock dividend which
was distributed to shareholders on May 28, 1993 and Valley historical per share
data has been retroactively restated for the 3 for 2 stock split effected in the
form of a 50% stock dividend which was distributed to shareholders on August 27,
1993. Shareholders are urged to read carefully this Joint Proxy
Statement-Prospectus and the attached appendices in their entirety.
 
THE COMPANIES
 
     M&I. M&I is a Wisconsin corporation incorporated in 1959 and a registered
bank holding company under the Bank Holding Company Act of 1956, as amended (the
"BHCA"). M&I's principal assets are the stock of its subsidiaries. M&I presently
owns substantially all of the capital stock of 38 banks with a total of 131
offices in Wisconsin and 12 offices in Arizona. M&I also owns a number of
companies engaged in businesses which are closely related to banking, including
the businesses of data processing, investment management, trust services,
mortgage banking, equipment leasing, venture capital and financial advisory
services, brokerage services, and insurance agency. As a bank holding company,
M&I provides financial and managerial assistance and services to its
subsidiaries. At September 30, 1993, M&I had consolidated total assets of
approximately $7.9 billion, consolidated total deposits of approximately $6.0
billion, and consolidated shareholders' equity of approximately $778 million.
M&I's principal executive offices are located at 770 North Water Street,
Milwaukee, Wisconsin 53202, and its telephone number is (414) 765-7801.
 
     Valley. Valley is a Wisconsin corporation incorporated in 1962 and a
registered bank holding company under the BHCA and registered savings and loan
holding company under the Home Owners' Loan Act of 1933, as amended (the
"HOLA"). Valley's principal assets are the stock of its subsidiaries. Valley
presently owns substantially all of the capital stock of 15 banks and 2 savings
associations with a total of 160 offices in Wisconsin. Valley also owns several
companies engaged in businesses which are closely related to banking, including
the businesses of trust and fiduciary services, credit card products and
processing, brokerage services and insurance agency services. Valley provides
financial and managerial assistance and services to its subsidiaries. At
September 30, 1993, Valley had consolidated total assets of approximately $4.4
billion, consolidated total deposits of approximately $3.7 billion, and
consolidated shareholders' equity of approximately $350 million. Valley's
principal executive offices are located at 100 West Lawrence Street, Appleton,
Wisconsin 54911, and its telephone number is (414) 738-3830.
 
THE SPECIAL MEETINGS
 
     M&I Special Meeting. The M&I Special Meeting will be held on Tuesday,
February 15, 1994, at 10:00 a.m., local time, at the M&I Marshall & Ilsley Bank,
770 North Water Street, Milwaukee, Wisconsin. At the M&I Special Meeting,
shareholders of M&I will be asked to consider and vote upon proposals (a) to
approve the Merger Agreement, (b) to approve an amendment to the M&I Articles in
order to (i) increase the authorized Common Stock of M&I from 80,000,000 shares
to 160,000,000 shares, (ii) remove the limitation that the Board of Directors
shall not be less than 8 nor more than 15 directors and replace it with a
provision which provides that the Board of Directors shall not be less than 3
directors, and (iii) remove the limitation that only two newly created
directorships may be filled by the directors in any period between annual
meetings of shareholders (the "M&I Articles Amendment"), and (c) to approve the
1993 Stock Option Plan. Holders of M&I Common Stock at the close of business on
December 20, 1993 (the "M&I Record Date") will be entitled to notice of and to
vote at the M&I Special Meeting. Each share of M&I Common Stock is entitled to
one vote on each proposal presented. As of the M&I Record Date, there were
60,828,773 outstanding shares of M&I Common Stock, of which 2,087,623 shares or
approximately 3.4% were held by M&I directors, executive officers and their
affiliates. As of the M&I Record Date, subsidiaries of M&I, acting as
fiduciaries, custodians or agents, had sole or shared voting power over
6,211,068 shares or
                                        3
<PAGE>   9
 
approximately 10.2% of the outstanding M&I Common Stock and Valley Trust
Company, a subsidiary of Valley, had sole or shared voting power over 58,580
shares or less than 1% of the outstanding M&I Common Stock. The affirmative vote
of two-thirds of the outstanding shares of M&I Common Stock as of the M&I Record
Date is required to approve the M&I Articles Amendment, and the affirmative vote
of a majority of the outstanding shares of M&I Common Stock is required to
approve the Merger Agreement. Approval of the 1993 Stock Option Plan requires
the affirmative vote of a majority of the shares present, or represented, and
entitled to vote on the proposal to approve the 1993 Stock Option Plan at the
M&I Special Meeting. Approval of the M&I Articles Amendment by holders of M&I
Common Stock is required for consummation of the Merger. Approval of the Merger
Agreement by holders of M&I Common Stock is not required for approval of the M&I
Articles Amendment or the 1993 Stock Option Plan. Approval of the 1993 Stock
Option Plan is not required for approval of the M&I Articles Amendment or
consummation of the Merger. See "THE SPECIAL MEETINGS."
 
     Valley Special Meeting. The Valley Special Meeting will be held on Tuesday,
February 15, 1994, at 10:00 a.m., local time, at the Paper Valley Hotel and
Conference Center, 333 West College Avenue, Appleton, Wisconsin. At the Valley
Special Meeting, shareholders of Valley will be asked to consider and vote upon
a proposal to approve the Merger Agreement. Holders of Valley Common Stock at
the close of business on December 20, 1993 (the "Valley Record Date") will be
entitled to notice of and to vote at the Valley Special Meeting. Each share of
Valley Common Stock is entitled to one vote. As of the Valley Record Date, there
were 20,721,290 outstanding shares of Valley Common Stock, of which 1,477,272
shares or approximately 7.1% were held by Valley directors, executive officers
and their affiliates. As of the Valley Record Date, Valley Trust Company, a
subsidiary of Valley, acted in a fiduciary capacity with respect to 3,843,246
shares or approximately 18.5% of the outstanding Valley Common Stock and M&I and
subsidiaries of M&I, acting as fiduciaries, custodians or agents, had sole or
shared voting power over 115,821 shares or less than 1% of the outstanding
Valley Common Stock. The affirmative vote of a majority of the outstanding
shares of Valley Common Stock as of the Valley Record Date is required to
approve the Merger Agreement. See "THE SPECIAL MEETINGS."
 
THE MERGER
 
     M&I and Valley have entered into the Merger Agreement which provides, after
satisfaction or waiver of all conditions described therein, for the Merger of
Valley with and into M&I, with M&I being the surviving corporation in the
Merger. The Merger will become effective upon the filing of Articles of Merger
with the Wisconsin Secretary of State (the "Effective Time"), which is expected
to occur as promptly as practicable following shareholder and regulatory
approvals and the satisfaction or waiver of other conditions contained in the
Merger Agreement. At the Effective Time, each outstanding share of Valley Common
Stock (except for shares owned by M&I for its own account or shares held in the
treasury of Valley), including rights appertaining thereto, will be converted
into the right to receive 1.72 shares of M&I Common Stock (the "Exchange
Ratio"). No fractional shares of M&I Common Stock will be issued to any Valley
shareholders. In lieu of fractional shares of M&I Common Stock, former holders
of Valley Common Stock will receive a cash payment for any fractional share
interest upon surrender of their certificates representing Valley Common Stock
in connection with the Merger. See "THE MERGER."
 
RECOMMENDATIONS OF THE BOARDS OF DIRECTORS AND REASONS FOR THE MERGER
 
     M&I. The Board of Directors of M&I has unanimously approved the Merger
Agreement and the M&I Articles Amendment. The Board of Directors of M&I also
unanimously approved (with 2 directors absent) the 1993 Stock Option Plan. The
M&I Board of Directors believes that the terms of the Merger are fair to, and in
the best interests of, M&I, its shareholders and other constituencies.
ACCORDINGLY, THE M&I BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT SHAREHOLDERS
OF M&I VOTE FOR APPROVAL OF THE MERGER AGREEMENT AND FOR APPROVAL OF THE M&I
ARTICLES AMENDMENT, AND RECOMMENDS THAT SHAREHOLDERS OF M&I VOTE FOR APPROVAL OF
THE 1993 STOCK OPTION PLAN. See "THE MERGER -- Reasons for the Merger and
Recommendations of Boards of Directors -- M&I."
 
                                        4
<PAGE>   10
 
     M&I Reasons. M&I believes a merger with Valley will create a combined
company having a significant market share in its home state of Wisconsin. The
Merger also allows M&I to enter and expand its operations in the fastest growing
markets of the state and to enhance efficiencies through the consolidation of
duplicate operations. M&I believes that Valley represents a unique partner for
M&I's expansion as the markets served by Valley and its product offerings
provide an excellent complement to M&I. See "THE MERGER -- Reasons for the
Merger and Recommendations of Boards of Directors -- M&I."
 
     Valley. The Board of Directors of Valley has unanimously approved the
Merger Agreement. The Valley Board of Directors believes that the terms of the
Merger are fair to, and in the best interests of, Valley and its shareholders.
ACCORDINGLY, THE VALLEY BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT
SHAREHOLDERS OF VALLEY VOTE FOR APPROVAL OF THE MERGER AGREEMENT. See "THE
MERGER -- Reasons for the Merger and Recommendations of Boards of Directors --
Valley."
 
     Valley Reasons. The Valley Board of Directors determined that the Merger is
preferable to the other alternatives which might be available to Valley, such as
remaining independent and growing internally and through future acquisitions, or
engaging in a transaction with another party. It made this determination because
it believes that the Merger will unite two healthy institutions with
complementary business strengths and operating philosophies, thereby creating a
combined institution with greater size, flexibility, diversity of services,
efficiencies, capital strength and profitability potential than either
institution possesses on a stand-alone basis or than Valley might be able to
achieve through such other alternatives. The Valley Board of Directors believes
that the Merger will permit the combined institution to compete effectively in
the rapidly changing marketplace for banking and financial services and to take
advantage of opportunities for growth and diversification that would not be
available to Valley on its own. See "THE MERGER -- Reasons for the Merger and
Recommendations of Boards of Directors -- Valley."
 
     See "THE MERGER -- Interests of Certain Persons in the Merger" for
information regarding interests of certain officers and directors of Valley in
the Merger.
 
OPINION OF FINANCIAL ADVISORS
 
     Opinion of M&I Financial Advisor. Salomon Brothers Inc ("Salomon Brothers")
delivered to the M&I Board of Directors its oral opinion, as of September 17,
1993, and its written opinion, as of the date of this Joint Proxy
Statement-Prospectus, that the Exchange Ratio is fair to the M&I shareholders
from a financial point of view. The opinion of Salomon Brothers sets forth the
assumptions made, the matters considered and the scope of review undertaken in
rendering such opinion. The full text of the opinion of Salomon Brothers is set
forth in Appendix D to this Joint Proxy Statement-Prospectus, which shareholders
of M&I are urged to read in its entirety. See "THE MERGER -- Opinions of
Financial Advisors -- M&I."
 
     Opinion of Valley Financial Advisor. Keefe, Bruyette & Woods, Inc. ("Keefe
Bruyette") delivered to the Valley Board of Directors its oral opinion, as of
September 19, 1993, and its written opinion, as of the date of this Joint Proxy
Statement-Prospectus, that the Exchange Ratio is fair to the Valley shareholders
from a financial point of view. The opinion of Keefe Bruyette sets forth the
assumptions made, the matters considered and the scope of review undertaken in
rendering such opinion. The full text of the opinion of Keefe Bruyette is set
forth in Appendix E to this Joint Proxy Statement-Prospectus, which shareholders
of Valley are urged to read in its entirety. See "THE MERGER -- Opinions of
Financial Advisors -- Valley."
 
CONDITIONS; TERMINATION; AMENDMENT
 
     Consummation of the Merger is subject to various conditions, including (a)
approval of the Merger Agreement by the M&I shareholders and by the Valley
shareholders, (b) approval of the M&I Articles Amendment by the M&I
shareholders, (c) receipt of regulatory approvals absent any conditions not
reasonably satisfactory to M&I and Valley, (d) receipt of an opinion of counsel
with respect to certain Federal income tax consequences of the Merger and (e)
receipt of an opinion of independent accountants to M&I and Valley that the
Merger qualifies for "pooling-of-interests" accounting treatment. See "THE
MERGER -- Conditions to the Merger."
 
                                        5
<PAGE>   11
 
     The Merger Agreement may be terminated notwithstanding shareholder approval
if certain specified events occur. For example, either M&I or Valley may
terminate the Merger Agreement if the Merger has not been consummated by
September 19, 1994, unless the Merger has not been consummated as a result of
certain governmental proceedings or litigation related to the Merger, in which
case either M&I or Valley may terminate the Merger Agreement if the Merger has
not been consummated by December 31, 1994. In addition, Valley may terminate the
Merger Agreement during the 10-day period commencing on the date the Board of
Governors of the Federal Reserve (the "Federal Reserve Board") issues an order
approving the consummation of the Merger (the "Federal Reserve Board Approval
Date"), if (a) the average of the daily closing prices of a share of M&I Common
Stock as reported on the NASDAQ/NMS during the period of 10 trading days ending
at the close of the third trading day immediately preceding the Federal Reserve
Board Approval Date (the "M&I Average Price") is less than $18, and (b) the M&I
Average Price has declined from the closing price of M&I Common Stock on
September 17, 1993 by more than 15% relative to the decline in the market prices
of a selected group of bank stocks during the same period. See "THE MERGER --
Termination; Amendment and Waiver."
 
     The Merger Agreement may be amended by the mutual consent of M&I and Valley
at any time prior to the Effective Time provided that, after approval of the
Merger Agreement by shareholders of Valley, no amendment may be made which would
reduce the amount or change the type of consideration into which each share of
Valley Common Stock would be converted. See "THE MERGER -- Termination;
Amendment and Waiver."
 
REGULATORY APPROVALS
 
     The Merger is subject to prior approval by the Federal Reserve Board and
the Office of Thrift Supervision (the "OTS"). M&I submitted applications seeking
approval of the Merger with the Federal Reserve Board and the OTS in December
1993. Certain aspects of the Merger will require notification to, or approvals
from, certain other federal and state regulatory authorities. Based on the
treatment of prior mergers and acquisitions involving other parties, M&I
anticipates that certain divestitures may be required by the Federal Reserve
Board or the Department of Justice as a condition to regulatory approval of the
Merger, and M&I has filed applications with the Federal Reserve Board proposing
divestiture of certain bank branches. At the present time, M&I management has
preliminarily identified branches in the State of Wisconsin with total deposits
of approximately $324 million as candidates for divestiture. There can be no
assurance, however, as to the amount of divestitures that will ultimately be
required in connection with the regulatory approval of the Merger. The impact of
these divestitures has not been quantified; however, it is anticipated that the
impact will not be material to the results of operations or financial condition
of the combined entity. The Federal Reserve Board has in the past generally
required that any divestitures be made prior to the consummation of the merger
with respect to which approval is sought. The Boards of Directors of M&I and
Valley are soliciting shareholder approval at this time to be in a position to
consummate the Merger as soon as practicable following the receipt of required
regulatory approvals and the satisfaction of any conditions contained therein.
There can be no assurances that the regulatory authorities will approve the
Merger, or if approved, as to the date of such approvals. There can also be no
assurances that any such approvals will not contain a condition or requirement
which causes such approvals to fail to satisfy the conditions to the
consummation of the Merger. There can be no assurance that the Department of
Justice will not challenge the Merger, or as to the result of any such
challenge, if made. See "CERTAIN REGULATORY CONSIDERATIONS."
 
ACCOUNTING TREATMENT
 
     The Merger is intended to qualify as a "pooling-of-interests" for
accounting and financial reporting purposes. Consummation of the Merger is
conditioned upon receipt by M&I and Valley of an opinion from Arthur Andersen &
Co. to the effect that the Merger qualifies for pooling-of-interests accounting
treatment. See "THE MERGER -- Accounting Treatment."
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
     The Merger is intended to constitute a reorganization under Section 368(a)
of the Internal Revenue Code of 1986, as amended (the "Code"). M&I and Valley
have received an opinion from Godfrey & Kahn,
                                        6
<PAGE>   12
 
S.C. to the effect that the Merger will be treated for federal income tax
purposes as a reorganization within the meaning of Section 368(a) of the Code,
based on customary assumptions and representations, and consummation of the
Merger is conditioned on such opinion not having been withdrawn or modified in
any material respect. Based in part on such assumptions and representations,
Godfrey & Kahn, S.C., is of the opinion that under currently applicable law: (a)
the Merger will constitute a reorganization within the meaning of Section 368(a)
of the Code, (b) no gain or loss will be recognized by the shareholders of
Valley upon their receipt of M&I Common Stock on conversion of their Valley
Common Stock in the Merger, except for cash received in lieu of fractional
shares, (c) the tax basis of the shares of M&I Common Stock received by
shareholders of Valley will be the same as the tax basis of their converted
Valley Common Stock, reduced by any amount allocable to any fractional share
interest for which cash is received, and (d) the holding period of the shares of
M&I Common Stock received by Valley shareholders in the Merger will include the
holding period of the shares of Valley Common Stock received in the Merger,
provided the shares of Valley Common Stock are held as a capital asset at the
Effective Time. Valley shareholders should consult their personal tax advisors
as to the tax consequences of the Merger under federal, state, local or other
applicable laws. See "THE MERGER -- Certain Federal Income Tax Consequences."
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
     Certain officers and directors of Valley may be deemed to have interests in
the Merger, as a result of provisions in the Merger Agreement relating to
indemnification of directors and officers of Valley by M&I, new employment
agreements for certain officers of Valley with M&I at the Effective Time which
include provisions for the grant of options to acquire M&I Common Stock, the
express assumption of Valley's obligations under current employment agreements
with respect to a "change of control transaction" (which will include an
election by the individual to treat the Merger as a "change of control
transaction"), and the continuance of certain other employee benefits. The new
employment agreements all have two year terms and provide, among other things,
for (i) annual salaries as follows: Mr. Mark L. Miller -- $180,000, Mr. Gary A.
Lichtenberg -- $175,000, Mr. Charles H. Sauter -- $160,000 and Mr. Sal A. Troia
- -- $135,000; (ii) minimum annual bonuses as follows: Mr. Miller -- $50,000, Mr.
Lichtenberg -- $50,000, Mr. Sauter -- $45,000 and Mr. Troia -- $35,000; and
(iii) options to purchase M&I Common Stock as follows: Mr. Miller -- 20,000
shares, Mr. Lichtenberg -- 40,000 shares, Mr. Sauter -- 40,000 shares and Mr.
Troia -- 20,000 shares. Under the terms of the Merger Agreement, Mr. Peter M.
Platten, III, could have also received an employment agreement with M&I, but Mr.
Platten has declined to accept such an employment agreement so as to be employed
by M&I following the Merger on the same basis as other M&I senior executive
officers who have change of control agreements but do not have employment
agreements. Mr. Platten will be compensated on the same basis as M&I's president
and will receive an option to purchase 100,000 shares of M&I Common Stock. In
addition, it is anticipated that Mr. Platten will enter into a "change of
control" employment agreement similar to those which current M&I executives have
entered into. These five officers and certain other Valley executives will also
receive benefits under existing employment agreements with Valley. M&I has also
agreed to provide Mr. Gus A. Zuehlke, Valley's Chairman, with a $100,000 annual
consulting fee. See "THE MERGER -- Interests of Certain Persons in the Merger"
and "CERTAIN RELATED TRANSACTIONS -- Employment Agreements and Related Matters."
The Merger Agreement provides that Messrs. Platten, Boldt and Zuehlke, currently
Valley directors, and one additional member of Valley's Board of Directors to be
determined by agreement of Valley and M&I who has not yet been selected, will be
appointed to M&I's Board of Directors at the Effective Time. The Merger
Agreement also provides that Mr. Platten (President and Chief Executive Officer
of Valley) will be appointed Vice Chairman of the Board of M&I at the Effective
Time and that each of Messrs. Lichtenberg (Senior Vice President, Chief
Financial Officer and Secretary of Valley), Sauter (Senior Vice President and
Chief Administrative Officer of Valley), Miller (Senior Vice President/Financial
Services of Valley) and Troia (President of Valley's bank support services
subsidiary) will be appointed a Senior Vice President of M&I at the Effective
Time. See "THE MERGER -- Management and Operations After the Merger."
 
STOCK OPTION AGREEMENT
 
     As a condition for M&I to enter into the Merger Agreement, M&I and Valley
entered into a Stock Option Agreement (the "Option Agreement"), dated as of
September 19, 1993, pursuant to which Valley
 
                                        7
<PAGE>   13
 
granted an option (the "Option") to M&I to purchase up to 4,045,795 shares of
Valley Common Stock (subject to adjustment for certain dilutive events), but in
no event in excess of 19.9% of the issued and outstanding shares of Valley
Common Stock, at an exercise price of $35.75 per share (the closing price of
Valley Common Stock on the NASDAQ/NMS on the last trading date preceding
execution and delivery of the Merger Agreement and the Option Agreement). A copy
of the Option Agreement is attached as Appendix B to this Joint Proxy
Statement-Prospectus. The Option is only exercisable upon the occurrence of
certain triggering and exercise events generally relating to competing
transactions for control of Valley. None of such events has occurred as of the
date of this Joint Proxy Statement-Prospectus. In lieu of exercising the Option,
M&I can require Valley to make a cash payment in an amount equal to the excess
of the value of the highest competing transaction, or, if greater, the highest
bid price for Valley Common Stock during the 30-day period preceding the cash
election, over the Option exercise price. The Option also grants M&I certain
registration rights with respect to, and grants Valley a right of first refusal
with respect to, any Valley Common Stock acquired upon exercise of the Option.
The Option Agreement may discourage competing offers to the Merger and is
intended to increase the likelihood that the Merger will be consummated in
accordance with the terms of the Merger Agreement. See "THE MERGER -- Stock
Option Agreement."
 
NO APPRAISAL OR DISSENTERS' RIGHTS
 
     Under the Wisconsin Business Corporation Law (the "WBCL"), subject to
certain exceptions inapplicable to the Merger, holders of shares of a Wisconsin
corporation quoted on the NASDAQ/NMS on the record date fixed to determine
shareholders entitled to notice of a shareholders meeting at which shareholders
are to vote on a merger are not entitled to appraisal or dissenters' rights.
Since both the M&I Common Stock and the Valley Common Stock were quoted on the
NASDAQ/NMS as of the M&I Record Date and Valley Record Date, respectively,
holders of both M&I Common Stock and Valley Common Stock have no appraisal or
dissenters' rights with respect to the Merger. See "THE MERGER -- No Appraisal
or Dissenters' Rights."
 
COMPARATIVE STOCK PRICES
 
     M&I Common Stock and Valley Common Stock are quoted on the NASDAQ/NMS,
under the symbols MRIS and VYBN, respectively. The following table sets forth
the closing sale price per share of M&I Common Stock and Valley Common Stock on
September 15, 1993, the last trading day preceding the public announcement by
Valley that it was considering a possible business combination with another
party, on September 17, 1993, the last trading day preceding the public
announcement of the execution of the Merger Agreement, and on December 28, 1993.
 
<TABLE>
<CAPTION>
                                                                     HISTORICAL           VALLEY
                                                                  -----------------     EQUIVALENT
                                                                   M&I      VALLEY     PER SHARE(1)
                                                                  ------    -------    ------------
<S>                                                               <C>       <C>        <C>
September 15, 1993.............................................   $24.25    $ 32.75       $41.71
September 17, 1993.............................................   $23.00    $ 35.75       $39.56
December 28, 1993..............................................   $24.00    $ 39.25       $41.28
</TABLE>
 
- -------------------------
(1) Represents the closing price of M&I Common Stock on the date presented
     multiplied by the Exchange Ratio of 1.72.
 
     Shareholders are urged to obtain current market quotations for shares of
M&I Common Stock and Valley Common Stock. No assurance can be given as to the
market price of M&I Common Stock at the Effective Time of the Merger or
thereafter.
 
SELECTED HISTORICAL AND PRO FORMA FINANCIAL DATA
 
     The following tables set forth (i) selected consolidated historical
financial data for the periods and as of the dates indicated for M&I and its
consolidated subsidiaries and for Valley and its consolidated subsidiaries and
(ii) unaudited pro forma combined selected financial data for the periods and as
of the dates indicated, giving effect to the Merger accounted for as a
pooling-of-interests. The consummation of the Merger is dependent upon obtaining
regulatory approvals, which may necessitate divestitures of certain bank
branches.
 
                                        8
<PAGE>   14
 
The ultimate composition of the divestitures has not been finalized, and
accordingly, no adjustment for divestitures has been included in the pro forma
financial data. Therefore, the final pro forma combined amounts may differ from
those set forth below. The following information should be read in conjunction
with and is qualified in its entirety by the consolidated financial statements
and accompanying notes of M&I and Valley included in the documents described
under "INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE" and the unaudited pro
forma combined financial statements and accompanying discussion and notes set
forth under "PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS." The Pro Forma
Selected Combined Financial Data is intended for informational purposes and is
not necessarily indicative of the future financial position or future results of
operations of the combined company or of the financial position or the results
of operations of the combined company that would have actually occurred had the
Merger been in effect as of the date or for the periods presented.
 
<TABLE>
<CAPTION>
                                      NINE MONTHS ENDED
                                        SEPTEMBER 30,                               YEARS ENDED DECEMBER 31,
                                   ------------------------    ------------------------------------------------------------------
                                      1993          1992          1992          1991          1990          1989          1988
                                   ----------    ----------    ----------    ----------    ----------    ----------    ----------
                                                        (DOLLAR AMOUNTS IN THOUSANDS EXCEPT PER SHARE DATA)
<S>                                <C>           <C>           <C>           <C>           <C>           <C>           <C>
M&I
SUMMARIZED INCOME STATEMENT DATA:
  Net interest income............  $  231,391    $  228,508    $  307,805    $  288,968    $  275,393    $  253,543    $  231,923
  Provision for loan losses......       6,674        10,885        15,151        20,555        39,775        12,344         8,355
  Other income...................     218,503       191,813       265,876       227,580       191,526       170,749       151,883
  Other expense..................     297,069       281,040       384,073       349,511       322,889       288,764       267,031
  Operating income(4)............      93,922        85,298       116,622        99,347        71,334        85,448        76,684

PER SHARE DATA(1):
  Primary operating income(4)....  $     1.39    $     1.27    $     1.73    $     1.50    $     1.08    $     1.28    $     1.16
  Fully diluted operating
    income(4)....................        1.30          1.19          1.62          1.40          1.03          1.21          1.10
  Book value.....................       11.98         11.11         11.47         10.31          9.28          8.59          7.64
  Dividends paid.................        0.40          0.36          0.48          0.43          0.39          0.35          0.31

AVERAGE BALANCE SHEET DATA:
  Assets.........................  $7,666,680    $7,405,015    $7,482,175    $7,289,543    $7,139,967    $6,770,734    $6,399,091
  Earning assets.................   6,955,729     6,746,168     6,812,012     6,628,573     6,448,340     6,082,877     5,740,036
  Deposits.......................   5,945,281     5,888,661     5,939,541     5,775,640     5,549,576     5,152,612     4,984,956
  Short-term borrowings..........     579,515       429,686       439,935       498,845       648,541       746,967       630,166
  Long-term borrowings...........     195,374       217,219       212,657       211,310       192,126       188,348       179,677
  Shareholders' equity...........     783,788       702,783       714,352       638,098       587,508       533,531       474,646

SELECTED FINANCIAL RATIOS:
  Return on average assets.......        1.64%         1.41%         1.46%         1.36%         1.00%         1.26%         1.20%
  Return on average equity.......       16.02         14.81         15.29         15.57         12.14         16.02         16.16
  Allowance for loan losses to
    total loans..................        1.76          1.70          1.76          1.55          1.44          1.24          1.32

  Nonperforming loans to loans
    outstanding(2)...............        0.75          0.86          0.82          1.21          1.15          1.03          1.26
  Allowance for loan losses to
    nonperforming loans(2).......         236           197           213           128           125           121           105
  Tier 1 risked-based capital
    ratio........................       12.90         13.17         13.34         11.95         10.59            --            --
  Total risked-based capital
    ratio........................       16.53         15.35         15.31         14.77         13.82            --            --
  Tier 1 leverage ratio..........        9.87          9.61          9.67          8.79          7.95            --            --
</TABLE>
 
            (See Notes Following Selected Pro Forma Financial Data)
 
                                        9
<PAGE>   15
 
<TABLE>
<CAPTION>
                                   NINE MONTHS ENDED
                                     SEPTEMBER 30,                           YEARS ENDED DECEMBER 31,
                                 ----------------------    -------------------------------------------------------------
                                   1993         1992         1992         1991         1990         1989         1988
                                 ---------    ---------    ---------    ---------    ---------    ---------    ---------
                                        (DOLLAR AMOUNTS IN THOUSANDS EXCEPT PER SHARE DATA)
<S>                              <C>          <C>          <C>          <C>          <C>          <C>          <C>
VALLEY
SUMMARIZED INCOME STATEMENT DATA:
  Net interest income..........  $  130,288    $ 122,244    $ 166,540    $ 141,605    $ 127,068    $ 114,668    $ 106,376
  Provision for loan losses....       6,478        6,461        8,395        8,369        7,864        6,796        5,226
  Other income.................      48,844       43,394       59,292       48,018       40,143       35,466       32,358
  Other expense................     122,315      117,920      160,102      140,999      120,410      105,382       98,365
  Net income...................      33,959       28,735       39,779       30,666       29,028       29,686       26,510
PER SHARE DATA(1):
  Net income...................  $     1.68    $    1.51    $    2.07    $    1.67    $    1.61    $    1.67    $    1.51
  Book value...................       17.23        15.91        16.24        14.69        13.95        13.12        12.18
  Dividends paid...............        0.69         0.64         0.85         0.80         0.75         0.69         0.59
AVERAGE BALANCE SHEET DATA:
  Assets.......................  $4,317,170   $4,007,418   $4,079,790   $3,750,237   $3,286,307   $2,974,979   $2,770,416
  Earning assets...............   3,994,951    3,683,679    3,755,068    3,433,816    2,990,782    2,711,206    2,512,063
  Deposits.....................   3,733,207    3,450,410    3,520,197    3,257,255    2,858,678    2,571,286    2,402,719
  Short-term borrowings........     112,381      131,178      120,349      106,076       84,369       98,086       75,757
  Long-term borrowings.........      66,642       72,802       71,676       79,414       44,619       37,084       46,142
  Shareholders' equity.........     339,323      289,590      298,062      262,567      244,773      225,245      204,988
SELECTED FINANCIAL RATIOS:
  Return on average assets.....        1.05%        0.96%        0.98%        0.82%        0.88%        1.00%        0.96%
  Return on average equity.....       13.34        13.23        13.35        11.68        11.86        13.18        12.93
  Allowance for loan losses to
    total loans................        1.28         1.27         1.26         1.20         1.10         1.11         1.10
  Nonperforming loans to loans
    outstanding(2).............        0.74         0.94         0.86         1.47         1.13         1.24         1.33
  Allowance for loan losses to
    nonperforming loans(2).....         172          136          146           81           97           90           82
  Tier 1 risked-based capital
    ratio......................       10.01         9.33         9.44         8.33         8.37           --           --
  Total risked-based capital
    ratio......................       11.26        10.69        10.76         9.67         9.72           --           --
  Tier 1 leverage ratio........        7.35         6.69         6.71         5.87         6.25         6.55         6.27
</TABLE>
 
            (See Notes Following Selected Pro Forma Financial Data)
 
                                       10
<PAGE>   16
 
<TABLE>
<CAPTION>
                               NINE MONTHS ENDED
                                 SEPTEMBER 30,                              YEARS ENDED DECEMBER 31,
                            ------------------------    ----------------------------------------------------------------
                               1993          1992          1992          1991          1990         1989         1988
                            ----------    ----------    ----------    ----------    ----------    ---------    ---------
                                        (DOLLAR AMOUNTS IN THOUSANDS EXCEPT PER SHARE DATA)
<S>                         <C>           <C>           <C>           <C>           <C>           <C>          <C>
PRO FORMA COMBINED
SUMMARIZED INCOME STATEMENT 
 DATA:
  Net interest income.....  $  361,679    $  350,752    $  474,345    $  430,573    $  402,461    $ 368,211    $ 338,299
  Provision for loan
    losses................      13,151        17,346        23,546        28,924        47,639       19,140       13,581
  Other income............     267,347       235,207       325,168       275,598       231,669      206,215      184,241
  Other expense...........     419,385       398,960       544,175       490,509       443,299      394,146      365,396
  Operating income(4).....     127,881       114,033       156,401       130,013       100,362      115,134      103,194
PER SHARE DATA:
  Primary operating
    income(4).............  $     1.24    $     1.13    $     1.55    $     1.33    $     1.03    $    1.17    $    1.07
  Fully diluted operating
    income(4).............        1.19          1.09          1.48          1.27          1.00         1.13         1.03
  Book value(3)...........       10.81         10.47         10.77          9.74          8.90         8.28         7.46
  Dividends paid..........        0.40          0.36          0.48          0.43          0.39         0.35         0.31
AVERAGE BALANCE SHEET DATA:
  Assets.................. $11,983,850   $11,412,433   $11,561,965   $11,039,780   $10,426,274   $9,745,713   $9,169,507
  Earning assets..........  10,950,480    10,429,847    10,567,080    10,062,389     9,439,122    8,794,083    8,252,099
  Deposits................   9,678,488     9,339,071     9,459,738     9,032,895     8,408,254    7,723,898    7,387,675
  Short-term borrowings...     691,896       561,404       560,284       604,921       732,910      845,053      705,923
  Long-term borrowings....     262,016       290,021       284,333       290,724       236,745      225,432      225,819
  Shareholders' equity....   1,123,111       992,373     1,012,414       900,665       832,281      758,776      679,634
SELECTED FINANCIAL RATIOS:
  Return on average
    assets................        1.43%         1.25%         1.29%         1.18%         0.96%        1.18%        1.13%
  Return on average
    equity................       15.22         14.35         14.72         14.44         12.06        15.17        15.18
  Allowance for loan
    losses to total
    loans.................        1.58          1.53          1.56          1.42          1.33         1.20         1.25
  Nonperforming loans to
    loans outstanding.....        0.74          0.89          0.83          1.30          1.14         1.09         1.28
  Allowance for loan
    losses to
    nonperforming loans...         212           172           187           109           116          110           98
  Tier 1 risked-based
    capital ratio.........       11.89         11.80         11.95         10.73          9.87           --           --
  Total risked-based
    capital ratio.........       14.68         13.68         13.69         13.06         12.49           --           --
  Tier 1 leverage ratio...        8.97          8.51          8.60          7.78          7.40           --           --
</TABLE>
 
- ---------------
 
(1) M&I's per share data has been retroactively restated for a 3 for 1 stock
    split in the form of a 200% stock dividend distributed to shareholders in
    May, 1993. Valley's per share data has also been retroactively restated for
    a 3 for 2 stock split in the form of a 50% stock dividend distributed to
    shareholders in August, 1993.
 
(2) Nonperforming loans include nonaccrual loans, restructured loans and loans
    90 days or more past due and still accruing interest.

(3) Pro forma book value per share amounts include the effects of an estimated
    one-time restructuring charge of approximately $80 million, $48 million net
    of tax effect. Since the estimated charge is nonrecurring, it has not been
    reflected in the pro forma combined earnings and net income per share
    amounts.
 
(4) Operating income and related earnings per share are before cumulative
    effects of changes in accounting principles for the nine months ended
    September 30, 1992 and the year ended December 31, 1992. See Note 6 under
    "PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS."
 
                                       11
<PAGE>   17
 
COMPARATIVE PER SHARE DATA (UNAUDITED)
 
     The following table sets forth for the M&I Common Stock and the Valley
Common Stock certain unaudited (i) historical per share financial information
and (ii) pro forma combined and pro forma equivalent per share financial
information for the periods and as of the dates indicated, giving effect to the
Merger accounted for as a pooling-of-interests. The consummation of the Merger
is dependent upon obtaining regulatory approvals, which may necessitate
divestitures of certain bank branches. The ultimate composition of the
divestitures has not been finalized, and accordingly, no adjustment for
divestitures has been included in the pro forma financial data. Therefore, the
final pro forma combined amounts may differ from those set forth below. It is
anticipated that the divestitures would not be material and, therefore, would
not preclude the Merger from being accounted for as a pooling of interests. M&I
historical per share amounts have been retroactively restated for the 3 for 1
stock split effected in the form of a 200% stock dividend which was distributed
to shareholders on May 28, 1993. Valley historical per share amounts have been
retroactively restated for the 3 for 2 stock split effected in the form of a 50%
stock dividend which was distributed to shareholders on August 27, 1993. The
following information should be read in conjunction with and is qualified in its
entirety by the consolidated financial statements and accompanying notes of M&I
and Valley included in the documents described under "INCORPORATION OF CERTAIN
DOCUMENTS BY REFERENCE" and the unaudited pro forma combined financial
statements and accompanying discussion and notes set forth under "PRO FORMA
COMBINED CONDENSED FINANCIAL STATEMENTS." The pro forma combined financial
information is intended for informational purposes and is not necessarily
indicative of the future financial position or future results of operations of
the combined company or of the financial position or the results of operations
of the combined company that would have actually occurred had the Merger been in
effect as of the dates or for the periods presented.
 
<TABLE>
<CAPTION>
                                                            HISTORICAL          M&I          VALLEY
                                                         ----------------    PRO FORMA      PRO FORMA
                                                          M&I      VALLEY    COMBINED     EQUIVALENT(2)
                                                         ------    ------    ---------    -------------
<S>                                                      <C>       <C>        <C>            <C>
Operating Income(1)
  Nine months ended September 30, 1993................   $ 1.30    $ 1.68     $  1.19        $  2.05
  Year ended December 31,
     1992.............................................   $ 1.62    $ 2.07     $  1.55        $  2.67
     1991.............................................     1.40      1.67        1.27           2.18
     1990.............................................     1.03      1.61        1.00           1.72

Cash Dividends
  Nine months ended September 30, 1993................   $  .40    $  .69     $   .40        $   .69
  Year ended December 31,
     1992.............................................   $  .48    $  .85     $   .48        $   .83
     1991.............................................      .43       .80         .43            .74
     1990.............................................      .39       .75         .39            .67

Book Value per Common Share
  As of September 30, 1993............................   $11.98    $17.23     $ 10.81        $ 18.59
  As of December 31, 1992.............................    11.47     16.24       10.77          18.52
</TABLE>
 
- -------------------------
(1) M&I historical and pro forma combined earnings per share are on a fully
    diluted basis. Valley historical earnings per share do not include the
    dilutive effect of stock options outstanding. Operating income per share
    for M&I and M&I Pro Forma Combined for the year ended December 31, 1992 is
    before the cumulative effects of changes in accounting principles. See
    Notes 3 and 6 under "PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS."
   
(2) The Valley pro forma equivalent represents the M&I pro forma combined amount
    multiplied by the Exchange Ratio of 1.72.
 
                                       12
<PAGE>   18
 
                              THE SPECIAL MEETINGS
 
GENERAL
 
     This Joint Proxy Statement-Prospectus is being furnished to shareholders of
M&I and Valley in connection with the solicitation of proxies by the Boards of
Directors of such companies for use at their respective Special Meetings,
including any adjournments or postponements thereof. The M&I Special Meeting
will be held on Tuesday, February 15, 1994 at 10:00 a.m., local time, at the M&I
Marshall & Ilsley Bank, 770 North Water Street, Milwaukee, Wisconsin. The Valley
Special Meeting will be held on Tuesday, February 15, 1994 at 10:00 a.m., local
time, at the Paper Valley Hotel and Conference Center, 333 West College Avenue,
Appleton, Wisconsin.
 
PROPOSALS TO BE CONSIDERED
 
     M&I. The M&I Special Meeting will be held to (i) consider and vote upon a
proposal to approve the Merger Agreement, (ii) consider and vote upon a proposal
to approve the M&I Articles Amendment, (iii) consider and vote upon a proposal
to approve the 1993 Stock Option Plan, and (iv) transact such other business as
may properly come before the M&I Special Meeting.
 
     Valley. The Valley Special Meeting will be held to consider and vote upon a
proposal to approve the Merger Agreement and to transact such other business as
may properly come before the Valley Special Meeting.
 
RECORD DATES AND VOTING RIGHTS
 
     M&I. Holders of M&I Common Stock at the close of business on the M&I Record
Date (December 20, 1993) will be entitled to notice of and to vote at the M&I
Special Meeting. Each share of M&I Common Stock is entitled to one vote on each
proposal presented. As of the M&I Record Date, there were 60,828,773 outstanding
shares of M&I Common Stock, of which 2,087,623 shares or approximately 3.4% were
held by M&I directors, executive officers and their affiliates. Directors and
executive officers of M&I have indicated that they intend to vote their shares
to approve the Merger Agreement, the M&I Articles Amendment, and the 1993 Stock
Option Plan. As of the M&I Record Date, subsidiaries of M&I, acting as
fiduciaries, custodians or agents, had sole or shared voting power over
6,211,068 shares or 10.2% of the outstanding M&I Common Stock and Valley Trust
Company, a subsidiary of Valley, had sole or shared voting power over 58,580
shares or less than 1% of the outstanding M&I Common Stock. Such shares held by
M&I and Valley subsidiaries will be voted in accordance with the governing
instruments or agreements and applicable law and regulations.
 
     Shares of M&I Common Stock constituting, as of the M&I Record Date, a
majority of the outstanding shares of M&I Common Stock must be represented in
person or by proxy at the M&I Special Meeting for a quorum to be present. The
affirmative vote of a majority of the outstanding shares of M&I Common Stock as
of the M&I Record Date is required to approve the Merger Agreement. The
affirmative vote of two-thirds of the outstanding shares of M&I Common Stock as
of the M&I Record Date is required to approve the M&I Articles Amendment. The
affirmative vote of a majority of the shares present, or represented, and
entitled to vote on the proposal to approve the 1993 Stock Option Plan is
required to approve the 1993 Stock Option Plan. Approval of the M&I Articles
Amendment by holders of M&I Common Stock is required for consummation of the
Merger. Approval of the Merger Agreement by holders of M&I Common Stock is not
required for approval of the M&I Articles Amendment or the 1993 Stock Option
Plan. Approval of the 1993 Stock Option Plan is not required for approval of the
M&I Articles Amendment or consummation of the Merger. Abstentions and broker
non-votes (i.e., proxies from brokers or nominees indicating that such persons
have not received instructions from the beneficial owners or other persons
entitled to vote shares as to a matter with respect to which the brokers or
nominees do not have discretionary power to vote) will be treated as present for
purposes of determining the presence of a quorum. With respect to the proposals
to approve the Merger Agreement and the M&I Articles Amendment, abstentions and
broker non-votes will have the effect of votes against such proposals. With
respect to the proposal to approve the 1993 Stock Option Plan, abstentions will
have the effect of votes against the proposal and broker non-votes will not be
counted as shares
                                       13
<PAGE>   19
 
entitled to vote on the proposal in determining whether a majority of the shares
present, or represented, and entitled to vote on the proposal have voted to
approve the 1993 Stock Option Plan.
 
     Valley. Holders of Valley Common Stock at the close of business on the
Valley Record Date (December 20, 1993) will be entitled to notice of and to vote
at the Valley Special Meeting. Each share of Valley Common Stock is entitled to
one vote on each proposal presented. As of the Valley Record Date, there were
20,721,290 outstanding shares of Valley Common Stock, of which 1,477,272 shares
or approximately 7.1% were held by Valley directors, executive officers and
their affiliates. Directors and executive officers of Valley have indicated that
they intend to vote their shares in favor of the Merger Agreement. As of the
Valley Record Date, Valley Trust Company, a subsidiary of Valley, acted in a
fiduciary capacity with respect to 3,843,246 shares or approximately 18.5% of
the outstanding Valley Common Stock and M&I and subsidiaries of M&I, acting as
fiduciaries, custodians or agents, had sole or shared voting power over 115,821
shares or less than 1% of the outstanding Valley Common Stock. Such shares held
by Valley and M&I subsidiaries will be voted in accordance with the governing
instruments or agreements and applicable laws and regulations.
 
     Shares of Valley Common Stock representing, as of the Valley Record Date, a
majority of the outstanding shares of Valley Common Stock must be represented in
person or by proxy at the Valley Special Meeting for a quorum to be present. The
affirmative vote of a majority of the outstanding shares of Valley Common Stock
as of the Valley Record Date is required to approve the Merger Agreement.
Abstentions and broker non-votes will be treated as present for purposes of
determining the presence of a quorum, but have the same effect as a vote against
the proposal to approve the Merger Agreement.
 
VOTING; REVOCATION OF PROXIES
 
     M&I. Shares of M&I Common Stock represented by a proxy properly signed and
received at or prior to the M&I Special Meeting, unless subsequently revoked,
will be voted in accordance with the instructions thereon. M&I has instituted a
Dividend Reinvestment and Cash Investment Plan (the "Reinvestment Plan")
administered by The First National Bank of Boston, as Trustee. Shares held in
the account of a participant in the Reinvestment Plan will be included on the
proxy for those shares registered in such participant's name and will be voted
as indicated thereon. Any proxy may be revoked by the person giving it at any
time prior to the voting of the proxy by giving written notice to the Secretary
of M&I, by properly executing and submitting a later-dated proxy, or by
attending the meeting and voting in person. If a proxy is signed and returned
without indicating any voting instructions, such proxy will be voted FOR the
proposal to approve the Merger Agreement, FOR the proposal to approve the M&I
Articles Amendment, and FOR the proposal to approve the 1993 Stock Option Plan.
 
     The M&I Board of Directors is not aware of any business to be acted upon at
the M&I Special Meeting other than as described herein. If, however, other
matters are properly brought before the M&I Special Meeting, the persons
appointed as proxies will have discretion to vote thereon in accordance with
their best judgment.
 
     Valley. Shares of Valley Common Stock represented by a proxy properly
signed and received at or prior to the Valley Special Meeting, unless
subsequently revoked, will be voted in accordance with the instructions thereon.
Shares held in the account of a participant in Valley's Automatic Dividend
Reinvestment Plan will be included on the proxy for those shares registered in
such participant's name and will be voted as indicated thereon. Any proxy may be
revoked by the person giving it at any time prior to the voting of the proxy by
giving written notice to the Secretary of Valley, by properly executing and
submitting a later-dated proxy, or by attending the meeting and voting in
person. If a proxy is signed and returned without indicating any voting
instructions, such proxy will be voted FOR the proposal to approve the Merger
Agreement.
 
     The Valley Board of Directors is not aware of any business to be acted upon
at the Valley Special Meeting other than as described herein. If, however, other
matters are properly brought before the Valley Special Meeting, the persons
appointed as proxies will have discretion to vote thereon in accordance with
their best judgment.
 
                                       14
<PAGE>   20
 
SOLICITATION OF PROXIES
 
     The enclosed proxy is being solicited by the Board of Directors of either
M&I or Valley for use in connection with the M&I Special Meeting or Valley
Special Meeting, as the case may be. M&I and Valley will each bear its own
expenses in connection with the Special Meetings, except that each company
agreed to pay one half of the cost incurred in connection with the printing and
filing of this Joint Proxy Statement-Prospectus and all Commission and other
regulatory filing fees in connection therewith and with the Merger. In addition
to solicitation of proxies by mail, directors, officers and employees of M&I and
Valley may make solicitation of proxies for their respective Special Meetings
either personally or by telephone, telegram or other forms of communication.
Such directors, officers and employees will receive no special compensation for
any solicitation.
 
     In addition, M&I and Valley have each retained Georgeson & Co. to assist in
the solicitation of proxies for a fee of $10,000 and $6,000, respectively, plus
expenses. Brokerage houses, nominees, fiduciaries and other custodians will be
requested to forward soliciting materials to beneficial owners and will be
reimbursed for their customary charges and expenses.
 
     VALLEY SHAREHOLDERS SHOULD NOT SEND STOCK CERTIFICATES WITH THEIR PROXY
CARDS.
 
                                   THE MERGER
 
     The following section of this Joint Proxy Statement-Prospectus describes
certain aspects of the Merger. This section does not purport to be complete and
is qualified in its entirety by reference to the Merger Agreement and Option
Agreement, copies of which are attached as Appendices A and B, respectively, to
this Joint Proxy Statement-Prospectus.
 
GENERAL
 
     M&I and Valley have entered into the Merger Agreement which provides, after
satisfaction or waiver of all conditions described therein, for the Merger of
Valley with and into M&I. The Merger will become effective at the Effective
Time, which will occur as promptly as practicable following shareholder and
regulatory approvals and the satisfaction or waiver of other conditions
contained in the Merger Agreement. At the Effective Time, each outstanding share
of Valley Common Stock (except for shares owned by M&I for its own account or
shares held in the treasury of Valley), including rights appertaining thereto,
will be converted into 1.72 shares (referred to herein as the Exchange Ratio) of
M&I Common Stock. No fractional shares of M&I Common Stock will be issued to any
Valley shareholder. In lieu of fractional shares of M&I Common Stock, former
holders of Valley Common Stock will receive a cash payment upon surrender of
their certificates representing Valley Common Stock in connection with the
Merger.
 
BACKGROUND OF THE MERGER
 
     In the Spring of 1993, J.B. Wigdale, Chairman of the Board and Chief
Executive Officer of M&I, contacted Peter M. Platten, III, President and Chief
Executive Officer of Valley, to ask Mr. Platten to consider whether Valley might
be interested in a possible business combination of the two companies. Following
authorization on June 3, 1993 by the Executive Committee of Valley's Board of
Directors, Mr. Platten and Mr. Wigdale proceeded with informal, conceptual
discussions concerning a possible combination. Mr. Platten also had private
meetings with senior management of certain out-of-state bank holding companies
having a Wisconsin presence to understand their methods of operating in
Wisconsin in order to assist Valley in assessing its long-term strategic
business plan. The objective of those meetings was not to entertain discussions
regarding possible business combinations between Valley and any of those bank
holding companies.
 
     Messrs. Platten and Wigdale and other executive officers of the two
companies began to meet in late June 1993 to discuss further the feasibility of
a business combination of Valley and M&I. Based on those meetings, Messrs.
Platten and Wigdale concluded that their respective institutions shared similar
operating philosophies and that the strengths of each institution would
complement the other in an impressive strategic fit.
 
                                       15
<PAGE>   21
 
     Beginning in mid-August 1993, senior executives of both companies engaged
in discussions to explore in more detail a possible business combination,
including strategies for integrating their respective operations, and the
potential benefits of such a transaction to the shareholders and other
constituents of their respective institutions. On September 1, 1993 senior
executives of Valley and M&I met in Fond du Lac, Wisconsin to discuss financial,
managerial and integration issues. M&I and Valley entered into customary
reciprocal confidentiality agreements dated September 2, 1993. During the next
several days the parties and their legal advisors discussed a proposed structure
of a transaction whereby Valley would merge into M&I, conducted initial due
diligence, and evaluated various financial issues which would impact the
transaction. Over the period from September 9, 1993 through September 12, 1993,
senior executives of Valley and M&I conducted negotiations with respect to the
exchange ratio based on the costs and benefits each side perceived from the
proposed transaction. On September 12, 1993, Mr. Platten and Mr. Wigdale
tentatively decided to use an exchange ratio of 1.72 shares of M&I Common Stock
for each share of Valley Common Stock as a working assumption, subject to
negotiation of a definitive exchange ratio and other material terms of the
transaction. Negotiations on the proposed transaction continued during the week
of September 12, 1993.
 
     In light of escalating price activity and significantly increased volume in
trading of Valley Common Stock on the NASDAQ/NMS, the National Association of
Securities Dealers, after consulting with representatives of Valley, halted
trading in Valley Common Stock late in the afternoon of September 16, 1993.
Valley issued a press release at that time stating that it was engaged in
discussions which could result in a significant business combination
transaction.
 
     Following the issuance of its press release, Valley received unsolicited
expressions of interest from four other bank holding companies. Each of these
companies was contacted briefly on September 17, 1993 to ascertain the nature,
seriousness and financial parameters of their interest. Three of the four
responded with certain proposed terms of a possible business combination with
Valley. The three companies that responded with such preliminary proposed terms
provided an expected range of value that they anticipated they would be able to
provide to Valley shareholders in a merger transaction, all of which the Valley
Board considered in connection with its assessment of the M&I proposal and as a
part of its decision to recommend the M&I proposal, as discussed below. See "--
Opinion of Financial Advisors -- Valley." None of these three proposals stated
specific exchange ratios regarding the number of shares proposed to be exchanged
for each share of Valley Common Stock. Each of these preliminary proposals was
tentative, subject to various conditions, including due diligence and the
negotiation of a definitive agreement, and, to varying degrees, were incomplete
with respect to various material terms, as contrasted with the M&I proposal
which established a specific exchange ratio, had been the subject of extensive
negotiations and was in the form of a proposed definitive agreement containing
all of the terms and conditions of the proposed transaction.
 
     On September 17, 1993 and, in the case of Valley, again on September 19,
1993, the Boards of Directors of M&I and Valley separately met to consider the
Merger Agreement, the Option Agreement and the related transactions and, in the
case of Valley, Amendment No. 1 (the "Valley Rights Agreement Amendment") to the
Rights Agreement (the "Valley Rights Agreement"), dated as of October 21, 1988,
between Valley and the First National Bank of Boston, as Rights Agent, and, in
the case of Valley, the unsolicited expressions of interest received following
its September 16, 1993 press release. At those meetings, members of M&I's and
Valley's senior management, together with their respective legal and financial
advisors, reviewed with the M&I Board of Directors and the Valley Board of
Directors, respectively, among other things, the background of the proposed
transaction, the potential benefits of the transaction, including the strategic
rationale for the combination, financial and valuation analyses and the terms
and conditions of the proposed agreements. See "-- Reasons for the Merger and
Recommendations of the Boards of Directors," and "-- Opinions of Financial
Advisors."
 
     At its meeting on September 17, 1993, the Board of Directors of M&I
unanimously approved the Merger Agreement, the Option Agreement and the related
transactions.
 
     The Valley Board met on September 17, 1993 to consider the proposed M&I
transaction together with the advice of its legal counsel, financial advisor and
independent public accountants and to assess the
 
                                       16
<PAGE>   22
 
long-term strategic business plan of Valley as it related to the interests of
Valley's shareholders, employees, depositors, customers and the communities
which Valley serves. As a result of its discussions, the Valley Board requested
that its financial advisor, Keefe Bruyette, attempt an analysis of the
unsolicited expressions of interest for the Board to consider at its next
meeting, recognizing the limited time and information available for such
analysis (see "-- Opinions of Financial Advisors -- Valley"), and the Valley
Board directed Valley's senior executive officers to further negotiate with M&I
regarding certain provisions of the Merger Agreement, and the Option Agreement,
including the exercise price and the triggering events for exercise of the
Option. Negotiations continued among senior executive officers of M&I and Valley
and their respective financial and legal advisors until the early afternoon of
September 19, 1993.
 
     At its September 19, 1993 meeting, the Valley Board further discussed the
proposed M&I transaction and reviewed with Valley's senior management and Keefe
Bruyette the aforementioned unsolicited expressions of interest. Because of the
Board's assessment of the long-term benefits presented by the proposed business
combination with M&I, including the complementary business strengths and
strategic fit of the two institutions, the opportunity for increased
efficiencies from a combination within Valley's Wisconsin market, and because
the combined company would be well positioned to grow through possible future
acquisitions or expansions while at the same time not being so large as to
reduce its attractiveness as a possible acquisition candidate, the Valley Board
concluded that the unsolicited expressions of interest were unlikely to result
in a superior proposal for Valley. Moreover, Valley's Board noted the
preliminary and contingent nature of these expressions of interest as compared
to the detailed, negotiated definitive Merger Agreement representing the terms
of the proposed transaction with M&I. Valley's Board was also concerned that,
were management to pursue discussions with other parties, M&I might withdraw or
materially modify its proposal. At that meeting, the Valley Board unanimously
approved the Merger Agreement, the Option Agreement and the related
transactions, and the Valley Rights Agreement Amendment. The Merger Agreement
and the Option Agreement were executed by both parties shortly thereafter.
 
     M&I management's proposal with respect to the range of potential exchange
ratios was based on M&I's assessment of (i) the value of Valley, including
Valley's historical earning and operating performance, M&I's projections of
Valley's future earning potential, and M&I's assessment of the intrinsic value
of Valley's franchise, and (ii) various external market criteria, including
price/earnings and price/book value multiples which M&I believed to be typical
for a transaction such as the Merger. M&I then proposed such range of exchange
ratios to Valley, and Valley and M&I negotiated such range with such
negotiations finally resulting in the Exchange Ratio. M&I consulted with Salomon
Brothers during this process, but Salomon Brothers did not participate in
negotiations with respect to the Exchange Ratio.
 
REASONS FOR THE MERGER AND RECOMMENDATIONS OF BOARDS OF DIRECTORS
 
     M&I. The Board of Directors of M&I believes that the terms of the Merger
are fair to, and in the best interests of, M&I, and its shareholders. The Board
of Directors of M&I also believes that the Merger is in the best interests of
M&I's employees, suppliers and customers and the communities in which M&I
operates. Accordingly, the Board of Directors of M&I unanimously recommends that
the shareholders of M&I vote FOR approval of the Merger Agreement.
 
     In reaching its conclusion, the M&I Board of Directors considered, among
other things, (a) information concerning the financial performance and
condition, business operations, capital levels, asset quality, loan portfolio
and prospects of Valley and information concerning the two companies on a
combined basis; (b) the structure of the transaction; (c) the terms of the
Merger Agreement, the Option Agreement and other documents to be executed in
connection with the Merger; (d) the presentation and recommendation made by the
management of M&I; (e) the opinion of Salomon Brothers that the Exchange Ratio
is fair to the M&I shareholders from a financial point of view and the
presentation by Salomon Brothers of the analyses performed by it in connection
with its opinion; and (f) the terms of other recent comparable combinations of
bank holding companies.
 
                                       17
<PAGE>   23
 
    The M&I Board's consideration of the foregoing factors included the
following:
 
    - M&I believes a merger with Valley will create a combined company having a
      significant market share in its home state of Wisconsin. The Merger also
      allows M&I to enter and expand its operations in the fastest growing
      markets of the state and to enhance efficiencies through the consolidation
      of duplicate operations. M&I believes that Valley represents a unique
      partner for M&I's expansion as the markets served by Valley and its
      product offerings provide an excellent complement to M&I.
 
    - M&I has traditionally focused its operations in Wisconsin. Based on June
      30, 1992 bank and savings association deposit data, M&I had approximately
      10.2% of the market share1 in Wisconsin (ranking second) and Valley had
      approximately 6.8% (ranking fourth). On a pro forma basis, at June 30,
      1992, the combined entity would have had approximately 17% of the deposits
      in Wisconsin, making it the largest financial institution in Wisconsin
      based on deposits in the state. In addition, as of June 30, 1992, the
      combined entity would be in the top three in market share in eight of the
      10 largest markets in Wisconsin.
 
    - Based on 1990 census information, the Madison, Green Bay and Appleton
      metropolitan areas are the fastest growing major population centers in
      Wisconsin. M&I has had minimal market penetration in Appleton and Green
      Bay, and ranked fourth in market share in Madison. Valley, on the other
      hand, ranked first in market share in Appleton, and third in Green Bay and
      Madison. On a combined basis, M&I would rank first in market share in
      Appleton and Madison, and second in Green Bay. M&I believes that the
      combined market share in these fast growing areas will provide M&I with a
      significant competitive advantage in Wisconsin.
 
    - Since there are geographical and functional overlaps between the banking
      and non-banking operations of M&I and Valley, M&I believes significant
      efficiencies can be obtained by the Merger through, among other things,
      the consolidation of duplicative administrative functions and facilities.
      M&I also anticipates that there will be significant conversion and
      processing efficiencies because Valley currently uses M&I Data Services
      systems. M&I estimates expense savings from consolidation at approximately
      $36 million per year beginning in 1995. However, there can be no assurance
      that such cost efficiencies will be realized.
 
    - M&I also believes that the merger with Valley allows M&I to accelerate
      its growth in Wisconsin without compromising its high asset quality
      standards and strong capital position. In this regard, M&I believes
      Valley's asset quality and capital position make it the most attractive
      entity to merge with M&I in Wisconsin.
 
    The M&I Board's primary analyses of and conclusions with respect to the
foregoing factors were (i) that the Merger would create a combined company
having significant market share in Wisconsin which would improve the competitive
position of the combined company, (ii) that the Merger would give M&I
significant market share in the Madison, Green Bay and Appleton metropolitan
areas which are the fastest growing regions of Wisconsin, (iii) that there would
be significant cost savings from the consolidation of duplicate operations which
would benefit the combined company, and (iv) that Valley would be an attractive
merger partner because of its high asset quality and strong capital position.
 
    Valley. The Board of Directors of Valley has determined that the terms of
the Merger are fair to, and in the best interests of, Valley and its
shareholders. Accordingly, the Board of Directors of Valley unanimously approved
the Merger Agreement and recommends that the shareholders of Valley vote FOR
approval of the Merger Agreement.
 
    In reaching its determination, the Valley Board of Directors consulted with
legal counsel with respect to the legal duties of the Board of Directors,
regulatory matters, tax matters and the Merger Agreement, Option
 
- ---------------
 
    1 Unless specifically indicated otherwise, all market share data referenced
in this section refers to the deposits of the specified institution in the 
specified region at June 30, 1992 compared to the total deposits of all
banks and savings associations in the specified region at June 30, 1992. The
deposit information is derived from reports filed with federal regulatory
agencies.
 
                                       18
<PAGE>   24
 
Agreement and issues related thereto. The Valley Board of Directors also
consulted with Keefe Bruyette, Valley's financial advisor, with respect to the
financial aspects and fairness of the financial terms of the transaction, and
with Arthur Andersen & Co., Valley's independent accountants, with respect to
appropriate accounting treatment of the transaction. The Valley Board of
Directors also consulted with senior management on all of the foregoing issues
as well as more conceptual issues and advantages of the proposed Merger. The
Board of Directors considered a number of factors, without assigning any
specific or relative weight to such factors. The material factors considered
were:
 
     (i) Information concerning the businesses, earnings, operations, financial
condition, prospects, capital levels and asset quality of Valley and M&I, both
individually and as combined. In particular, the Board of Directors focused on
the strategic fit of the two institutions with Valley's strength in retail
banking complementing M&I's strength in commercial banking, the similar
operating philosophies of the two institutions, and the significant contribution
of fee-based income and opportunity for growth provided by M&I's data processing
and trust operations;
 
     (ii) The advantages of a combination with another Wisconsin-based
institution, including the building of market share without undue market
concentration concerns, enhanced exposure to commercial and consumer banking
markets, and the opportunities for increased efficiencies and significant cost
savings from a combination within the Wisconsin market resulting in increased
profitability of the combined entity over time;
 
     (iii) The current and prospective economic and competitive environments
facing Valley and other financial institutions characterized by intensifying
competition from both banks and nonbank financial services organizations, the
increasing necessity for strong fee-based income producing components within a
bank holding company, and the growing costs associated with regulatory
compliance in the banking industry;
 
     (iv) The belief that the combined company would be well positioned to grow
through possible future acquisitions or expansions while at the same time not
being so large as to reduce its attractiveness as a possible acquisition
candidate;
 
     (v) The financial advice rendered by Keefe Bruyette that the Exchange Ratio
is fair to the shareholders of Valley from a financial point of view (see "--
Opinions of Financial Advisors -- Valley");
 
     (vi) A comparison of the terms of the Merger Agreement, the Option
Agreement and the other documents relating to the Merger to the terms
customarily seen in similar transactions;
 
     (vii) The continuing influence of certain of Valley's directors and
executive management personnel in the combined institution and, in particular,
the continuing influence of Valley's management in retail banking; and
 
     (viii) The impact of the Merger on Valley's employees in terms of working
environment and career opportunities, on Valley's depositors and customers in
terms of the wider range of products and services that will be available from a
strong and sound combined institution, and on the communities which Valley
serves in terms of the enhanced strength and accessibility of the combined
Wisconsin franchise.
 
     The Valley Board's analysis of the foregoing factors included the following
considerations, all of which the Valley Board concluded would present the
potential for increased shareholder value in the future and which weighed in
favor of a business combination with M&I: (i) Valley's dependence on earnings
from retail banking, which have been subject to increasing margin pressure, and
countervailing benefits associated with M&I's complementary strength in
commercial banking and significant percentage of fee-based income not subject to
such margin pressure; (ii) the less attractive alternatives available to Valley
in light of the continuing trend of bank consolidations; (iii) the significant
advantage, opportunities and cost savings presented by an in-market merger with
M&I, especially in view of the complementary characteristics of M&I and Valley,
as opposed to a possible out-of-market business combination; (iv) that the
Merger would result in shareholders of Valley receiving stock in a high quality
combined company that should benefit shareholders through enhanced operating
efficiencies and better penetration of commercial and consumer banking markets;
and (v) that the combined company would be well positioned to grow through
possible future acquisitions or
 
                                       19
<PAGE>   25
 
expansions while at the same time not being so large as to reduce its
attractiveness as a possible acquisition candidate.
 
     The Valley Board of Directors determined that the Merger is preferable to
the other alternatives which might be available to Valley, such as remaining
independent and growing internally and through future acquisitions, or engaging
in a transaction with another party. It made this determination because it
believes that the Merger will unite two healthy institutions with complementary
business strengths and operating philosophies, thereby creating a combined
institution with greater size, flexibility, diversity of services, efficiencies,
capital strength and profitability potential than either institution possesses
on a stand-alone basis or than Valley might be able to achieve through such
other alternatives. The Valley Board of Directors believes that the Merger will
permit the combined institution to compete effectively in the rapidly changing
marketplace for banking and financial services and to take advantage of
opportunities for growth and diversification that would not be available to
Valley on its own.
 
OPINIONS OF FINANCIAL ADVISORS
 
     M&I
 
     Salomon Brothers has delivered to the M&I Board of Directors its oral
opinion, as of September 17, 1993, and its written opinion, as of the date of
this Joint Proxy Statement-Prospectus, that the Exchange Ratio was fair, from a
financial point of view, to the shareholders of M&I. No limitations were imposed
by the M&I Board of Directors upon Salomon Brothers with respect to the
investigations made or procedures followed by Salomon Brothers in rendering its
opinions.
 
     THE FULL TEXT OF THE OPINION OF SALOMON BROTHERS DATED AS OF THE DATE OF
THIS JOINT PROXY STATEMENT-PROSPECTUS, WHICH SETS FORTH ASSUMPTIONS MADE,
MATTERS CONSIDERED AND LIMITS ON THE REVIEW UNDERTAKEN BY SALOMON BROTHERS, IS
ATTACHED HERETO AS APPENDIX D. M&I SHAREHOLDERS ARE URGED TO READ THIS OPINION
IN ITS ENTIRETY. SALOMON BROTHERS' OPINION IS DIRECTED ONLY TO THE EXCHANGE
RATIO AND DOES NOT CONSTITUTE A RECOMMENDATION TO ANY M&I SHAREHOLDER AS TO HOW
SUCH SHAREHOLDER SHOULD VOTE AT THE M&I SPECIAL MEETING. THE SUMMARY OF THE
OPINION OF SALOMON BROTHERS SET FORTH IN THIS JOINT PROXY STATEMENT-PROSPECTUS
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF SUCH OPINION. THE
SEPTEMBER 17, 1993 ORAL OPINION WAS SUBSTANTIALLY IDENTICAL TO THE OPINION
ATTACHED HERETO.
 
     In connection with the opinion attached hereto, Salomon Brothers reviewed,
among other things, the following: (a) the Merger Agreement; (b) the Joint Proxy
Statement-Prospectus in substantially the same form as to be sent to M&I
shareholders; (c) the Annual Reports on Form 10-K of M&I and of Valley for each
year in the three-year period ended December 31, 1992; (d) the Quarterly Reports
on Form 10-Q of M&I and of Valley for the three-month periods ended March 31,
1993, June 30, 1993 and September 30, 1993; (e) Reports on Form 8-K of M&I dated
September 19, 1993, as amended, and of Valley dated September 19, 1993; (f)
certain other publicly available financial and other information concerning M&I
and Valley, and the trading markets for the publicly traded securities of M&I
and Valley; (g) certain other internal information, including projections,
relating to M&I and Valley, prepared by the managements of M&I and Valley and
furnished to Salomon Brothers for purposes of its analysis; and (h) publicly
available information concerning certain other banks and bank holding companies,
the trading markets for their securities and the nature and terms of certain
other merger and acquisition transactions which Salomon Brothers believed
relevant to its inquiry. Salomon Brothers also met with certain officers and
representatives of M&I and Valley to discuss the foregoing, as well as other
matters believed relevant to its inquiry.
 
     In conducting its review and in arriving at its opinion, Salomon Brothers
relied upon and assumed the accuracy and completeness of the financial and other
information provided to it or publicly available and did not attempt
independently to verify the same. Salomon Brothers relied upon the managements
of M&I and Valley as to the reasonableness and achievability of the projections
(and the assumptions and bases therefor) provided to Salomon Brothers, and
assumed that such projections reflected the best currently available estimates
and judgments of such managements and that such projections would be realized in
the amounts and in the time periods estimated by such managements. Salomon
Brothers also assumed, without independent verification, that the aggregate
allowances for loan losses for M&I and Valley were adequate to cover such
losses. Salomon Brothers did not make or obtain any evaluations or appraisals of
the property of
 
                                       20
<PAGE>   26
M&I or Valley, nor did Salomon Brothers examine any individual loan credit
files. Salomon Brothers was retained by the M&I Board of Directors to express an
opinion as to the fairness, from a financial point of view, to the shareholders
of M&I of the Exchange Ratio and did not address the underlying business
decision to proceed with the Merger.
 
     Salomon Brothers considered such financial and other factors as Salomon
Brothers deemed appropriate under the circumstances, including among others the
following: (a) the historical and current financial position and results of
operations of M&I and Valley, including interest income, interest expense, net
interest income, net interest margin, non-interest income, non-interest expense,
earnings, dividends, internal capital generation, book value, intangible assets,
return on assets, return on shareholders' equity, capitalization, the amount and
type of non-performing assets, loan losses and the reserve for loan losses, all
as set forth in the financial statements for M&I and Valley; (b) the assets and
liabilities of M&I and Valley, including the loan and investment portfolios,
deposits, other liabilities, historical and current liability sources and costs
and liquidity; and (c) the nature and terms of certain other merger and
acquisition transactions involving banks and bank holding companies. Salomon
Brothers also took into account its assessment of general economic, market and
financial conditions and its experience in other transactions, as well as its
experience in securities valuation and its knowledge of the banking industry
generally. Salomon Brothers' opinion was necessarily based upon conditions as
they existed and could be evaluated on the date of such opinion and the
information made available to Salomon Brothers through the date of such opinion.
Salomon Brothers' opinion does not constitute a recommendation to the M&I Board
of Directors or to any shareholder of M&I with respect to any approval of the
Merger.
 
     In connection with rendering its opinion to the M&I Board of Directors,
Salomon Brothers performed a variety of financial analyses which are summarized
below. Salomon Brothers believes that its analysis must be considered as a whole
and that selecting portions of such analyses and the factors considered therein,
without considering all factors and analyses, could create an incomplete view of
the analyses and the processes underlying Salomon Brothers' opinion. The
preparation of a fairness opinion is a complex process involving subjective
judgments and is not necessarily susceptible to partial analyses or summary
description. In its analyses, Salomon Brothers made numerous assumptions with
respect to industry performance, business and economic conditions, and other
matters, many of which are beyond the control of M&I or Valley. Any estimates
contained in Salomon Brothers' analyses are not necessarily indicative of future
results or values, which may be significantly more or less favorable than such
estimates. Estimates of values of companies do not purport to be appraisals or
necessarily reflect the prices at which companies or their securities actually
may be sold. None of the analyses performed by Salomon Brothers was assigned a
greater significance by Salomon Brothers than any other.
 
     The projections reviewed by Salomon Brothers were prepared by the
managements of M&I and Valley. Neither M&I nor Valley publicly discloses
internal management projections of the type provided to the M&I Board of
Directors and to Salomon Brothers in connection with the review of the Merger.
Such projections were not prepared with a view towards public disclosure. The
projections were based on numerous variables and assumptions which are
inherently uncertain, including without limitation factors related to general
economic and competitive conditions. Accordingly, actual results could vary
significantly from those set forth in such projections.
 
     The following is a brief summary of the analyses performed by Salomon
Brothers in connection with its oral opinion delivered on September 17, 1993 to
the M&I Board of Directors:
 
          (a) Transaction Summary. Salomon Brothers summarized the offer made by
     M&I to Valley, analyzing the Exchange Ratio and the price per share of M&I
     Common Stock, as of September 16, 1993, with respect to the implied
     purchase price per share of Valley Common Stock, the total transaction
     value and the premium to the market value of Valley Common Stock (as of one
     day and as of thirty days prior to September 16, 1993) represented by the
     implied purchase price per share, and as a multiple of certain historical
     and projected financial statement items including the latest twelve months'
     and 1993 projected earnings per share, fully diluted book value and fully
     diluted tangible book value. This analysis showed that the M&I offer, at
     such date, represented a purchase price of $39.99 per share of Valley
     Common
                                       21
<PAGE>   27
 
     Stock, multiples of 18.0x and 17.1x the latest twelve months' and 1993
     projected earnings per share of Valley Common Stock, respectively, and a
     multiple of 2.36x and 2.60x fully diluted book value and fully diluted
     tangible book value per share of Valley Common Stock, respectively.
 
          (b) Analysis of Other Merger Transactions. Salomon Brothers analyzed
     certain other intra-market bank and bank holding company merger and
     acquisition transactions for the U.S. as a whole, and for nine midwestern
     states as a subset of the whole, for the period from January 1, 1988
     through September 16, 1993 in which the total consideration paid had a
     value of between $250 million and $1.25 billion and analyzed a subset of
     these transactions where the target company's return on average assets was
     greater than 0.90%. Salomon Brothers then compared the multiples implied by
     the M&I offer with high, low and median deal multiples for the other bank
     and bank holding company merger and acquisition transactions analyzed. This
     analysis compared the price/latest twelve months' earnings, price/book
     value and price/tangible book value multiples of the M&I offer to the high,
     low and median multiples for the transactions analyzed, and calculated the
     premiums to market prices, earnings per share dilution and the percent of
     overhead reduction which would be required for zero dilution for the M&I
     offer and for the high, low and median deal multiples. Set forth below are
     the high, low and median deal multiples presented to the M&I Board of
     Directors:
 
                               U.S. INTRA-MARKET
                     TRANSACTIONS GREATER THAN $250 MILLION
                          BUT LESS THAN $1.25 BILLION
                   FROM JANUARY 1, 1988 TO SEPTEMBER 16, 1993
 
<TABLE>
<CAPTION>
                                                                              RETURN ON
                                                              ALL           AVERAGE ASSETS
                                                          TRANSACTIONS        OF TARGET
                                                           CONSIDERED     GREATER THAN 0.90%    M&I OFFER
                                                          ------------    ------------------    ---------
<S>                                                       <C>             <C>                   <C>
Price/Latest Twelve Months' Earnings:                                                             18.0x
     High..............................................       32.3x              19.0x
     Low...............................................       11.9               11.9
     Median............................................       16.3               15.8
Price/Book Value:                                                                                 2.36x
     High..............................................       2.77x              2.77x
     Low...............................................       1.17               1.93
     Median............................................       2.12               2.61
Price/Tangible Book Value:                                                                        2.60x
     High..............................................       2.99x              2.90x
     Low...............................................       1.17               1.96
     Median............................................       2.45               2.69
</TABLE>
 
                                       22
<PAGE>   28
 
                              MIDWEST INTRA-MARKET
                     TRANSACTIONS GREATER THAN $250 MILLION
                          BUT LESS THAN $1.25 BILLION
                   FROM JANUARY 1, 1988 TO SEPTEMBER 16, 1993
 
<TABLE>
<CAPTION>
                                                                             RETURN ON
                                                         ALL MIDWEST       AVERAGE ASSETS
                                                         TRANSACTIONS        OF TARGET
                                                          CONSIDERED     GREATER THAN 0.90%    M&I OFFER
                                                         ------------    ------------------    ---------
<S>                                                      <C>             <C>                   <C>
Price/Latest Twelve Months' Earnings:                                                            18.0x
     High.............................................       32.3x              16.7x
     Low..............................................       12.5               14.4
     Median...........................................       16.4               16.3
Price/Book Value:                                                                                2.36x
     High.............................................       2.77x              2.77x
     Low..............................................       1.37               2.61
     Median...........................................       1.94               2.74
Price/Tangible Book Value:                                                                       2.60x
     High.............................................       2.99x              2.90x
     Low..............................................       1.45               2.79
     Median...........................................       2.43               2.86
</TABLE>
 
     Salomon Brothers' analysis showed that the range of implied valuations per
share of Valley Common Stock, applying the high, low and median deal multiples
described above to Valley's latest twelve months' earnings, book value and
tangible book value, was $17.97 to $71.92. The results produced in this analysis
do not purport to be indicative of actual values or expected values of Valley or
the shares of Valley Common Stock.
 
     The bank merger and acquisition transactions for the United States included
in the above multiples analysis were:
 
<TABLE>
<CAPTION>
 STATE       STATE
   OF          OF
ACQUIROR    ACQUIREE    ACQUIROR                                ACQUIREE
- --------    --------    --------                                --------
<S>         <C>         <C>                                     <C>
 CA          CA         First Interstate Bancorp                San Diego Financial Corporation
 PA          NJ         CoreStates Financial Corp.              Constellation Bancorporation
 PA          PA         PNC Bank Corp.                          First Eastern Corp.
 MN          NM         Norwest Corporation                     First United Bank Group
 PA          PA         Meridian Bancorp                        Commonwealth Bancshares Corp.
 NC          VA         First Union Corp.                       First American Metro Corp.
 MN          CO         First Bank System, Inc.                 Colorado National Bankshares, Inc.
 NC          VA         First Union Corporation                 Dominion Bankshares Corporation
 PA          PA         Integra Financial Corp.                 Equimark Corporation
 FL          FL         Barnett Banks, Inc.                     First Florida Banks, Inc.
 OH          TX         Banc One Corporation                    Team Bancshares, Inc.
 MI          IN         NBD Bancorp                             INB Financial Corporation
 MI          IN         NBD Bancorp                             Summcorp
 OH          OH         Society Corporation                     Ameritrust Corporation
 MI          MI         First of America Bank Corporation       Security Bancorp, Inc.
 CA          NV         BankAmerica Corporation                 Valley Capital Corporation
 OH          IL         Banc One Corporation                    First Illinois Corporation
 PR          PR         Banco Popular de Puerto Rico            BanPonce Corporation
 PA          PA         CoreStates Financial Corp.              First Pennsylvania Corp.
 NDL         IL         Algemene Bank Nederland N.V.            Exchange Bancorp, Inc.
 MD          MD         MNC Financial Inc.                      Equitable Bancorporation
 OH          OH         Society Corporation                     Trustcorp, Inc.
 NC          FL         First Union Corp.                       Florida National Banks of Florida, Inc.
 ENG         NJ         National Westminster Bancorp, Inc.      Ultra Bancorporation
 MO          MO         Boatmen's Bancshares, Inc.              Centerre Bancorporation
</TABLE>
 
                                       23
<PAGE>   29
 
     The bank merger and acquisition transactions where the target company's
return on average assets was greater than 0.90% included in the above multiples
analysis were:
 
<TABLE>
<CAPTION>
 STATE       STATE
   OF          OF
ACQUIROR    ACQUIREE                  ACQUIROR                                ACQUIREE
- --------    --------    -------------------------------------   -------------------------------------
<S>         <C>         <C>                                     <C>
 PA          PA         Meridian Bancorp                        Commonwealth Bancshares Corp.
 MN          CO         First Bank System, Inc.                 Colorado National Bankshares
 MI          MI         First of America Bank Corporation       Security Bancorp
 CA          NV         BankAmerica Corporation                 Valley Capital Corporation
 OH          IL         Banc One Corporation                    First Illinois Corporation
 PA          PA         CoreStates Financial Corp.              First Pennsylvania Corporation
 NDL         IL         Algemene Bank Nederland N.V.            Exchange Bancorp, Inc.
 MD          MD         MNC Financial Inc.                      Equitable Bancorporation
 ENG         NJ         National Westminster Bancorp, Inc.      Ultra Bancorporation
</TABLE>
 
          (c) Pro Forma Merger and Contribution Analyses. Salomon Brothers
     analyzed certain balance sheet and income statement data for Valley and M&I
     for 1992 on an actual and pro forma combined basis, and for Valley and M&I
     on a projected pro forma combined basis for 1993, 1994 and 1995. The
     analysis showed, among other things, that the Merger would result in
     dilution in earnings per share of M&I Common Stock in 1993 and 1994
     followed by an increase in fully diluted earnings per share of M&I Common
     Stock for 1995. The analysis also showed that the shareholders of M&I would
     own 67.3% of the combined entity and that, attributing the cost savings
     projected to result from the Merger to Valley, M&I would contribute 73.2%,
     69.2% and 66.0% of the income of the combined entity for 1993, 1994 and
     1995, respectively, on a pro forma combined basis.
 
          (d) Discounted Cash Flow. Salomon Brothers performed a discounted cash
     flow analysis using discount rates of 12.0%, 14.0% and 16.0% and terminal
     price multiples ranging from 8x to 18x and using 1995 estimated earnings
     (including costs savings projected to result from the Merger) and Valley's
     management's projection of dividends for 1993, 1994 and 1995. This analysis
     showed a range of present values per share of Valley Common Stock from
     $25.93 to $58.76. The results produced in this analysis did not purport to
     be indicative of actual values or expected values of Valley or the shares
     of Valley Common Stock.
 
     Salomon Brothers also analyzed the stock price performance of Valley and of
M&I, compared to the S&P Composite Average (500 stocks) and to the Salomon
Brothers' Regional Bank Index. Salomon Brothers analyzed certain credit and
other operating statistics for M&I, Valley and the combined entity, comparing
these statistics to comparable average data for the institutions included in the
Salomon Brothers' Regional Bank Index. These analyses showed, among other
things, that for the year ended December 31, 1992 net interest margin for Valley
was 4.61% compared to 4.50% for the institutions included in the Salomon
Brothers' Regional Bank Index and Valley's return on average assets was 0.98%
compared to 0.93% for the institutions included in the Salomon Brothers'
Regional Bank Index, and that as of June 30, 1993, Valley's loan loss provision
was 0.27% of average loans compared to 0.76% for the institutions included in
the Salomon Brothers' Regional Bank Index. The analysis also showed that, on a
pro forma combined basis for Valley and M&I for the year ended December 31,
1992, net interest margin was 4.65% and return on average assets was 1.29%.
 
     Based on these analyses, Salomon Brothers rendered an oral opinion to the
M&I Board of Directors on September 17, 1993 that the Exchange Ratio was fair,
from a financial point of view, to the shareholders of M&I. In connection with
its opinion dated as of the date of this Joint Proxy Statement-Prospectus,
Salomon Brothers also confirmed the appropriateness of its reliance on the
analyses used to render its September 17, 1993 opinion by performing procedures
to update certain of such analyses and by reviewing the assumptions on which
such analyses were based and the factors considered in connection therewith.
 
                                       24
<PAGE>   30
 
     Salomon Brothers is a nationally recognized investment banking firm and is
continually engaged in the valuation of businesses and securities in connection
with mergers and acquisitions, negotiated underwritings, competitive biddings,
secondary distributions of listed and unlisted securities and valuations for
estate, corporate and other purposes. M&I selected Salomon Brothers as its
financial advisor because of its reputation and because Salomon Brothers has
substantial experience in transactions such as the Merger.
 
     M&I and Salomon Brothers have entered into a letter agreement, dated August
31, 1993 (the "Salomon Engagement Letter"), relating to the services to be
provided by Salomon Brothers in connection with the Merger. M&I has agreed to
pay Salomon Brothers' fees as follows: $750,000 contingent upon and payable
following the execution of a definitive agreement for the merger (which has been
paid); $750,000 contingent upon and payable following the mailing of proxy
materials relating to the Merger to M&I shareholders; and $1,250,000 contingent
upon the consummation of the Merger and payable at the closing thereof. In the
Salomon Engagement Letter, M&I also has agreed to reimburse Salomon Brothers for
its reasonable and necessary out-of-pocket expenses and to indemnify Salomon
Brothers against certain liabilities, including liabilities under the federal
securities laws.
 
     Salomon Brothers from time to time has provided investment banking and
financial advisory services to M&I for which Salomon Brothers has received
customary compensation. Such services have included acting as agent for M&I's
Medium Term Note program and as a managing underwriter of an offering of
subordinated debentures of M&I in 1993 for which Salomon Brothers received
customary compensation. In addition, in the ordinary course of its business,
Salomon Brothers actively trades the debt and equity securities of M&I and
Valley for its own account and for the accounts of its customers and,
accordingly, at any time may hold a long or short position in such securities.
Salomon Brothers may also assist M&I in the divestiture of certain assets
necessary to obtain regulatory approval of the Merger. See "CERTAIN REGULATORY
CONSIDERATIONS." It is expected that Salomon Brothers would receive customary
compensation for such services.
 
     Valley
 
     General. Valley retained Keefe Bruyette to render financial advisory and
investment banking services to Valley in connection with a possible business
combination between Valley and M&I.
 
     Keefe Bruyette is a recognized investment banking firm and, as part of its
investment banking business, is continually engaged in the valuation of bank and
bank holding company securities in connection with acquisitions, negotiated
underwritings, secondary distributions of listed and unlisted securities,
private placements and valuations for various other purposes. As specialists in
the securities of banking companies, Keefe Bruyette has experience in, and
knowledge of, the valuation of banking enterprises. Keefe Bruyette was selected
on the basis of its ability to evaluate the fairness of the Exchange Ratio, from
a financial point of view, as set forth in the Merger Agreement, its
qualifications, its previous experience and its reputation in the banking and
investment communities. Keefe Bruyette has acted exclusively for the Board of
Directors of Valley in rendering its fairness opinion and will receive a fee
from Valley for its services.
 
     Keefe Bruyette rendered oral and written opinions to the Board of Directors
of Valley that, as of September 19, 1993 and as of the date of this Joint Proxy
Statement-Prospectus, respectively, the Exchange Ratio was fair, from a
financial point of view, to the holders of the Valley Common Stock. The full
text of Keefe Bruyette's opinion, dated the date of this Joint Proxy
Statement-Prospectus, is attached as Appendix E, and is incorporated herein by
reference. The description of the written opinion set forth herein is qualified
in its entirety by reference to the full text of the opinion attached as
Appendix E. Valley shareholders are urged to read the opinion in its entirety
for a description of the procedures followed, assumptions made, matters
considered, and qualifications and limitations on the review undertaken, by
Keefe Bruyette in connection therewith. No limitations were imposed by Valley
with respect to the investigations made or procedures followed by Keefe Bruyette
in rendering its opinions.
 
     Keefe Bruyette's opinions are directed only to the Exchange Ratio and do
not constitute a recommendation to any Valley shareholder as to how such
shareholder should vote at the Valley Special Meeting.
 
     Materials and Information Considered With Respect to M&I Offer. In
connection with its opinions, Keefe Bruyette reviewed, analyzed and relied upon
material bearing upon the financial and operating
                                       25
<PAGE>   31
 
condition of Valley and M&I, including, among other things, the following: (i)
the Merger Agreement; (ii) the Registration Statement (including this Joint
Proxy Statement-Prospectus); (iii) Annual Reports to Shareholders and Annual
Reports on Form 10-K for the three years ended December 31, 1992 of Valley and
M&I; (iv) certain interim reports to shareholders and Quarterly Reports on Form
10-Q of Valley and M&I and certain other communications from Valley and M&I to
their respective shareholders, such as press releases and letters to
shareholders; (v) other financial information concerning the businesses and
operations of Valley and M&I furnished to Keefe Bruyette by Valley and M&I for
purposes of its analysis, including certain internal financial analyses and
forecasts for Valley and M&I prepared by the senior management of Valley and
M&I; (vi) certain publicly available information concerning trading of, and the
trading market for, the Valley Common Stock and the M&I Common Stock; and (vii)
certain publicly available information with respect to banking companies and the
nature and terms of certain other transactions that Keefe Bruyette considers
relevant to its inquiry. In addition, Keefe Bruyette held discussions with
senior management of Valley and M&I concerning their past and current
operations, financial condition and prospects, and results of recent regulatory
examinations. The results of recent regulatory examinations were considered
favorable due to the absence of material asset quality problems at either
company, the adequacy of the capital of both companies, and the overall good
financial condition of both companies.
 
     Keefe Bruyette also discussed the strategic objectives of the Merger and
plans for the combined company with senior executives of M&I and Valley; and
performed certain limited analyses with respect to the unsolicited expressions
of interest regarding possible business combinations that Valley received prior
to the September 19, 1993 meeting of the Valley Board of Directors at which the
Merger Agreement was approved. See "-- Background of the Merger."
 
     In conducting its review and arriving at its opinions, Keefe Bruyette
relied upon and assumed the accuracy and completeness of all of the financial
and other information provided to it or publicly available, and Keefe Bruyette
did not attempt independently to verify such information. Keefe Bruyette relied
upon the management of Valley and of M&I as to the reasonableness and
achievability of the financial and operating forecasts and projections (and the
assumptions and bases therefor) provided to it, and assumed that such forecasts
and projections reflect the best currently available estimates and judgments of
such managements and that such forecasts and projections will be realized in the
amounts and in the time periods currently estimated by such managements. Keefe
Bruyette also assumed, without independent verification, that the aggregate
allowances for loan losses for Valley and M&I as set forth in such financial
statements and projections are adequate to cover such losses. Keefe Bruyette did
not make or obtain any independent evaluation or appraisals of the property of
Valley or M&I, nor did Keefe Bruyette examine any individual loan credit files.
Keefe Bruyette was informed by Valley and assumed for purposes of its opinions
that the Merger will be accounted for as a pooling-of-interests under generally
accepted accounting principles.
 
     Keefe Bruyette considered such financial and other factors as it deemed
appropriate under the circumstances, including, among others, the following: (i)
the historical and current financial position and results of operations of
Valley and M&I; (ii) the assets and liabilities of Valley and M&I; and (iii) the
nature and terms of certain other merger transactions involving banks and bank
holding companies. Keefe Bruyette also took into account Keefe Bruyette's
assessment of general economic, market and financial conditions and Keefe
Bruyette's experience in other transactions, Keefe Bruyette's experience in
securities valuation and Keefe Bruyette's knowledge of the banking industry
generally. Keefe Bruyette's opinions are necessarily based upon conditions as
they existed and could be evaluated on the dates of such opinions and the
information made available to Keefe Bruyette through the dates of such opinions.
 
     The projections reviewed by Keefe Bruyette were prepared by the managements
of Valley and M&I. Neither Valley nor M&I publicly discloses internal management
projections of the type provided to the Valley Board of Directors and to Keefe
Bruyette in connection with the review of the Merger. Such projections were not
prepared with a view towards public disclosure. The projections were based on
numerous variables and assumptions which are inherently uncertain, including,
without limitation, factors related to general economic and competitive
conditions. Accordingly, actual results could vary significantly from those set
forth in such projections.
 
                                       26
<PAGE>   32
 
     Summary of Analysis of M&I Offer. Set forth below is a brief summary of
selected analyses presented by Keefe Bruyette to the Valley Board of Directors
in connection with its oral opinion as to the fairness, from a financial point
of view, of the Exchange Ratio.
 
     Keefe Bruyette reviewed certain historical financial information for Valley
and M&I and calculated the imputed value of the M&I offer to holders of Valley
Common Stock. This analysis showed a value of $39.56 per share of Valley Common
Stock based upon the Exchange Ratio of 1.72 and the closing price of the M&I
Common Stock on September 17, 1993 of $23.00 per share. Keefe Bruyette also
calculated the multiple which the Exchange Ratio represents, based on the $39.56
per share purchase price, when compared to Valley's Common Stock closing market
price of $32.75 on September 15, 1993 (the last trading day prior to an
extraordinary increase in the market price of Valley Common Stock attributed to
takeover speculation), Valley's June 30, 1993 book value per share of $16.88,
its 1993 estimated earnings per share of $2.30 and its 1994 estimated earnings
per share of $2.55 (such estimates being based on Keefe Bruyette's published
estimates). The price to book value multiple was 234%, the premium to market
value was 20%, and the price to 1993 and 1994 estimated earnings multiples were
17.2 times and 15.5 times, respectively.
 
     Comparison to Other Companies and Transactions. Keefe Bruyette compared the
financial performance of Valley based on various financial measures of earnings
performance, capital adequacy and asset quality, to that of a peer group of bank
holding companies with assets ranging from approximately $2.0 to $7.0 billion,
including Star Banc Corporation, Commerce Bancshares, Inc., Fourth Financial
Corp., Liberty National Bancorp, Inc., Provident Bancorp, First Bancorp of Ohio,
Magna Group, Associated Banc-Corp and Fort Wayne National Corp. This analysis
showed, among other things, that the group had an average return on assets of
1.23% and an average return on equity of 14.36% for the second quarter of 1993,
versus 1.07% and 13.58%, respectively, for Valley. The analysis also showed that
the group had an average equity/asset ratio of 7.80%, versus 7.19% for Valley.
The peer group for the second quarter of 1993 recorded a net interest margin of
4.60% versus 4.52% for Valley, and the peer group had an average efficiency
ratio of 61.3% compared to 67.6% for Valley. On the measure of non-performing
assets as a percentage of loans plus other real estate owned, the peer group had
an average of 1.39% at June 30, 1993, versus 0.81% for Valley.
 
     Keefe Bruyette compared the financial performance of M&I based on various
financial measures of performance to that of a peer group of bank holding
companies in the Midwest including Banc One Corporation, National City
Corporation, Comerica Inc., Society Corporation, Boatmen's Bancshares, Inc.,
First of America Bank Corporation, Huntington Bancshares, Firstar Corporation,
Mercantile Bancorporation, Inc., Old Kent Financial Corp. and Star Banc
Corporation. This analysis showed, among other things, that using financial data
as of June 30, 1993 and market data as of September 16, 1993, M&I had a
price-to-book value multiple of 1.94 times compared to a range of multiples
ranging from 1.46 times to 2.25 times for the peer group, a price-to-earnings
multiple based on 1994 estimated earnings of 12.4 times compared to a range of
8.5 times to 11.4 times for the peer group, and a dividend yield of 2.3%
compared to a range of 3.0% to 4.1% for the peer group. Keefe Bruyette's
financial comparison showed that for the second quarter of 1993 M&I earned 1.67%
on assets and 16.09% on equity, versus 1.37% and 17.27%, respectively, for the
peer group. In addition, Keefe Bruyette showed that M&I's equity/asset ratio
equaled 9.6%, versus 7.04% for the peer group. M&I's net interest margin for the
second quarter equaled 4.58%, versus 5.06% for the peer group, and its
efficiency and expense ratios were 64.8% and 1.50%, versus 61.1% and 2.29% for
the peer group. The ratio of non-performing assets at June 30, 1993 was 1.02%
for M&I and 1.49% for the peer group.
 
     Keefe Bruyette examined the history of trading prices for both Valley and
M&I Common Stock for the period from January 1989 to August 1993. Keefe Bruyette
also examined the relationship between movements of Valley and M&I Common Stock
market prices and movements in the Keefe Bank Index of 24 banking companies and
the S&P 500 Index. This analysis showed that the price of M&I Common Stock
substantially outperformed Valley Common Stock and the other indices over the
period from January 1989 through August 1993, and that movements in the market
price of Valley Common Stock and M&I Common Stock from January 1993 through
August 1993 were relatively comparable.
 
     Keefe Bruyette reviewed certain financial data relating to 14 bank merger
transactions which had occurred since March, 1992. The selection of bank mergers
included the following transactions (ac-
 
                                       27
<PAGE>   33
quiror/acquiree): CoreStates Financial Corp./Constellation Bancorporation;
Norwest Corporation/First United Bank Group; PNC Bank Corp./First Eastern
Corporation; Boatmen's Bancshares/First Amarillo Bancorp; First Security
Corporation/First National Financial Corp; Banc One Corporation/Firstier
Financial; Meridian Bancorporation/Commonwealth Bancshares Corp.; Bank of New
York Co./National Community Banks; First Bank System/Colorado National
Bankshares, Inc.; First Union Corp./Dominion Bankshares Corporation; Banc One
Corporation/Key Centurion Bancshares; Barnett Banks, Inc./First Florida Banks,
Inc.; Banc One Corporation/Team Bancshares, Inc.; and Boatmen's Bancshares,
Inc./Sunwest Financial Services. In each case, Keefe Bruyette calculated the
price as a multiple of earnings, book value, tangible book value and
preannouncement market price. In the selected transactions, the calculations
yielded a range of: (i) price to earnings multiples of 13.3 to 21.2 with an
average of 15.9, compared with a multiple of 17.2 associated with the Merger;
(ii) price to book value multiples of 1.50 to 2.54 with an average of 2.13
compared with a multiple of 2.34 associated with the Merger; and (iii) price to
preannouncement market price multiples of 1.06 to 1.77 with the average of 1.34
compared with a multiple of 1.20 associated with the Merger. Because of the
extraordinary increase that occurred in the market price of Valley Common Stock
on September 16, 1993, just prior to Valley's first press release (see "--
Background of the Merger"), the market price used for Valley Common Stock to
compute these ratios is $32.75 per share, which is the closing price reported on
the NASDAQ/NMS for September 15, 1993.
 
     No company or transaction used in the above analysis as a comparison is
identical to Valley, M&I or the contemplated Merger. Accordingly, an analysis of
the results of the foregoing is not mathematical; rather, it involves complex
considerations and judgments concerning differences in financial and operating
characteristics of the companies and other factors that could affect the public
trading value of the companies to which they are being compared.
 
     Other Considerations and Analyses With Respect to M&I Offer. Keefe Bruyette
analyzed the relative contribution of each of Valley and M&I to certain balance
sheet and income statement items, including assets, common equity, and 1993 and
1994 estimated earnings. Keefe Bruyette then compared the ownership percentages
of the combined company implied by the relative contributions of such balance
sheet and income statement items, resulting in an ownership percentage for
Valley shareholders of approximately 35.5% at the Exchange Ratio of 1.72. The
contribution analysis showed that by virtue of the Exchange Ratio, Valley would
contribute approximately 36.0% of the combined assets, 29.3% of the combined
common equity and 26.6% of the estimated 1994 earnings of the two companies.
 
     Keefe Bruyette estimated the present value of the future streams of
after-tax cash flows that Valley could produce through 1998. The analysis was
based on several assumptions, including a $1.44 dividend per share in 1998, and
an earnings per share of $3.47 in 1998. A terminal value was calculated for 1998
by multiplying Valley's projected 1998 earnings by a Price/Earnings multiple of
18.1 times, chosen to reflect a possible acquisition premium. This terminal
valuation analysis and the annual dividend payments were discounted at rates
ranging from 12.0% to 16.0%, producing potential values per share of Valley from
$30.08 to $36.66.
 
     Keefe Bruyette compared these values to the potential value provided to
Valley shareholders in the Merger. This analysis was based upon varying
assumptions concerning earnings growth rates, dividend rates and exit multiples,
which assumptions are themselves based upon many factors and assumptions many of
which are beyond the control of Valley and M&I. As indicated below, this
analysis is not necessarily indicative of actual values or actual future results
and does not purport to reflect the prices at which any security may trade at
the present time or any time in the future.
 
     Keefe Bruyette illustrated the earnings dilution that would be incurred by
M&I based upon the proposed Exchange Ratio. The analysis showed a 7.7% dilution
in earnings per share based upon 1994 estimated earnings of the combined company
following the Merger.
 
     Written Opinion on M&I Offer. In connection with its written opinion dated
as of the date of this Joint Proxy Statement-Prospectus, Keefe Bruyette
confirmed the appropriateness of its reliance on the analyses used to render its
September 19, 1993 oral opinion by performing procedures to update certain of
such analyses and by reviewing the assumptions on which such analyses were based
and the factors considered in connection therewith.
 
                                       28
<PAGE>   34
 
     Consideration of Unsolicited Expressions of Interest. As discussed under
"-- Background of the Merger," Valley received four unsolicited preliminary
expressions of interest with respect to a possible business combination from
other bank holding companies, and each of these companies was contacted briefly
on September 17, 1993 to ascertain the nature, seriousness and financial
parameters of their interest. Three of the four responded with certain proposed
terms of a possible business combination with Valley. The three companies that
responded with such preliminary proposed terms provided an expected range of
value that they anticipated they would be able to provide to Valley shareholders
in a merger transaction. These preliminary indications were (i) $34 to $36
(which was lower on its face than the price implied by the M&I proposal), (ii)
$40, and (iii) $41 to $42. No specific exchange ratios or pricing formulas were
stated regarding the number of shares proposed to be exchanged for each share of
Valley stock. Each of these preliminary indications was tentative, subject to
various conditions, including due diligence and the negotiation of a definitive
agreement, and, to varying degrees, were incomplete with respect to various
material terms, as contrasted with the M&I proposal which established a specific
exchange ratio, had been the subject of extensive negotiations and was in the
form of a proposed definitive agreement containing all of the terms and
conditions of the proposed transaction.
 
     At the September 19, 1993 meeting of the Valley Board of Directors, Keefe
Bruyette reviewed the financial performance, market performance, and historic
stock trading prices of the other four companies relative to each other and as
compared to M&I and concluded that M&I compared favorably with the other four
companies on such criteria. Keefe Bruyette measured financial performance
primarily in terms of returns on assets (1.67% for M&I versus 1.53%, 1.38%,
1.30% and 1.56% for the other four companies), returns on equity (16.09% for M&I
versus 17.48%, 19.84%, 17.03% and 18.76% for the other four companies), net
interest margins (4.58% for M&I versus 6.21%, 5.66%, 5.17% and 5.21% for the
other four companies), efficiency ratios (64.79% for M&I versus 61.33%, 71.24%,
60.42% and 62.48% for the other four companies), expense ratios (1.50% for M&I
versus 2.94%, 3.08%, 2.13% and 2.14% for the other four companies) and asset
quality ratios such as net charge-offs to average loans (0.06% for M&I versus
0.67%, 0.72%, 0.96% and 0.20% for the other four companies). Keefe Bruyette
measured market performance in terms of estimated price to earnings ratios for
1993 (12.78x for M&I versus 12.46x, 12.62x, 14.03x and 10.76x for the other four
companies) and 1994 (11.79x for M&I versus 11.22x, 11.04x, 9.65x and 10.11x for
the other four companies), market to book ratios (1.94x for M&I versus 2.17x,
2.57x, 1.79x and 2.00x for the other four companies) and market to tangible book
ratios (2.00x for M&I versus 2.34x, 2.95x, 2.19x and 2.20x for the other four
companies). Keefe Bruyette also reviewed the potential earnings dilution, on
both aggregate and incremental bases, that each of these parties might be
expected to experience as a result of a business combination with Valley at a
range of assumed prices, and compared it to the projected dilution of M&I
associated with the Merger at the Exchange Ratio. Such analyses showed that none
of the other four companies was likely to be in a position to offer greater
value to holders of Valley Common Stock than that provided by the M&I proposal.
 
     Limitation on Opinions. The information above summarizes the material
analyses prepared by Keefe Bruyette in connection with its opinions. This
summary does not purport to be a complete description of the analyses performed
by Keefe Bruyette in connection with the rendering of its fairness opinions. The
preparation of a fairness opinion is not necessarily susceptible to partial
analysis or summary description. Keefe Bruyette believes that its analyses and
the summary set forth above must be considered as a whole and that selecting
portions of its analyses, without considering all analyses, or selecting part of
all of the above summary, without considering all factors and analyses, would
create an incomplete view of the process underlying the analyses set forth in
the Keefe Bruyette presentations and opinions. The range in calculations
resulting from any particular analyses described above should not be taken to be
Keefe Bruyette's view of the actual value of Valley or M&I. The fact that any
specific analysis has been referred to in the summary above is not meant to
indicate that such analysis was given more weight than any other analyses.
 
     In performing its analyses, Keefe Bruyette made numerous assumptions with
respect to industry performance, general business and economic conditions and
other matters, many of which are beyond the control of Valley or M&I. Such
analyses were prepared solely as part of Keefe Bruyette's analysis of the
fairness of the Exchange Ratio, from a financial point of view, to Valley's
shareholders and were provided to
 
                                       29
<PAGE>   35
the Valley Board of Directors in connection with the delivery of Keefe
Bruyette's opinions. The analyses do not purport to be appraisals or to reflect
the prices at which a company might actually be sold or the prices at which any
securities may be traded in the future. In addition, as described above, Keefe
Bruyette's opinion and presentation to the Valley Board of Directors is just one
of the many factors taken into consideration by the Valley Board.
 
     Fees Paid to Keefe Bruyette. Valley has paid Keefe Bruyette a cash fee of
$100,000 to date, and has agreed to pay a cash fee of $100,000 promptly
following the mailing of this Joint Proxy Statement-Prospectus. Valley will also
pay Keefe Bruyette at the time of, and contingent upon, the closing of the
Merger a cash fee of $450,000. Valley has also agreed to reimburse Keefe
Bruyette for its reasonable out-of-pocket expenses and to indemnify Keefe
Bruyette against certain liabilities, including liabilities under the federal
securities laws.
 
MERGER CONSIDERATION
 
     The Merger Agreement provides that, at the Effective Time, each then
outstanding share of Valley Common Stock, other than shares held in the treasury
of Valley or owned by M&I for its own account, will be automatically converted
into the right to receive 1.72 shares (referred to herein as the Exchange Ratio)
of M&I Common Stock. The Exchange Ratio is subject to adjustment in the event of
a M&I or Valley stock split, stock dividend or other similar transaction between
the date of the Merger Agreement and the Effective Time. Each share of Valley
Common Stock held in the treasury of Valley or owned by M&I for its own account
(which excludes shares held in trust accounts, managed accounts, or similar
accounts beneficially owned by third parties) at the Effective Time will be
cancelled and extinguished without any conversion thereof or payment made with
respect thereto. For a description of the M&I Common Stock to be received in
connection with the Merger, see "DESCRIPTION OF M&I CAPITAL STOCK" and for a
description of certain differences in the rights of shareholders of M&I and
Valley, see "COMPARISON OF SHAREHOLDER RIGHTS." No fractional shares will be
issued to any Valley shareholders. In lieu of fractional shares of M&I Common
Stock, former holders of Valley Common Stock will receive a cash payment upon
surrender of their certificates of Valley Common Stock in connection with the
Merger. See "-- Conversion of Shares; Exchange of Certificates; No Fractional
Shares."
 
     The shares of M&I Common Stock outstanding at the Effective Time will
remain outstanding shares of M&I Common Stock following the Effective Time.
 
     At the Effective Time, all rights with respect to Valley Common Stock
pursuant to stock options granted by Valley under Valley's stock option plans,
whether or not then exercisable, will be converted into and will become rights
with respect to M&I Common Stock and M&I will assume each such stock option in
accordance with the terms of the applicable stock option plan under which it was
issued, as adjusted to reflect the Exchange Ratio. See "-- Effect on Employee
Benefits and Stock Options."
 
EFFECTIVE TIME
 
     The "Effective Time" of the Merger will occur upon the filing of Articles
of Merger with the Secretary of State of the State of Wisconsin, which will
occur as promptly as practicable after the satisfaction of or, if permissible,
waiver of all conditions to the Merger Agreement. It is expected that a period
of time will elapse between the Special Meetings and the Effective Time while
the parties seek to obtain the regulatory approvals required in order to
consummate the Merger. See "CERTAIN REGULATORY CONSIDERATIONS." The Merger
Agreement may be terminated by either party if, among other reasons, the Merger
has not been consummated on or before September 19, 1994, or, at the latest,
December 31, 1994, if the delay is a result of proceedings of a governmental
authority or litigation related to the Merger. See "-- Termination; Amendment
and Waiver."
 
CONVERSION OF SHARES; EXCHANGE OF CERTIFICATES; NO FRACTIONAL SHARES
 
     At the Effective Time, by virtue of the Merger and without any action on
the part of M&I, Valley, or the holders of M&I Common Stock or Valley Common
Stock, each share of Valley Common Stock issued and outstanding immediately
prior to the Effective Time will be converted into the right to receive 1.72
shares of
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<PAGE>   36
M&I Common Stock (referred to herein as the Exchange Ratio). All such shares of
Valley Common Stock will no longer be outstanding and will automatically be
cancelled and retired and will cease to exist, and each certificate previously
representing any such shares of Valley Common Stock will thereafter represent
the right to receive a certificate representing shares of M&I Common Stock into
which such Valley Common Stock is convertible. Certificates previously
representing shares of Valley Common Stock will be exchanged for certificates
representing whole shares of M&I Common Stock upon the surrender of such
certificates as provided below, without interest. No fractional share of M&I
Common Stock will be issued, and, in lieu thereof, a cash payment will be made
as provided below.
 
     As of the Effective Time, M&I will deposit, or cause to be deposited, with
a bank or trust company designated by M&I (the "Exchange Agent") certificates
representing the shares of M&I Common Stock (such certificates for shares of M&I
Common Stock, together with any dividends or distributions with respect thereto,
being hereinafter referred to as the "Exchange Fund") issuable pursuant to the
terms of the Merger Agreement to former holders of Valley Common Stock at the
Effective Time. As soon as reasonably practicable after the Effective Time, the
Exchange Agent will mail to each holder of record of a certificate or
certificates which immediately prior to the Effective Time represented
outstanding shares of Valley Common Stock (the "Certificates"), whose shares of
Valley Common Stock were converted into the right to receive shares of M&I
Common Stock, (i) a letter of transmittal and (ii) instructions for use in
effecting the surrender of the Certificates in exchange for certificates
representing shares of M&I Common Stock. Upon surrender of a Certificate for
cancellation to the Exchange Agent together with a properly executed letter of
transmittal, the holder of such Certificate will receive a certificate
representing that number of whole shares of M&I Common Stock which such holder
has the right to receive in respect of the Certificate surrendered (after taking
into account all shares then held by such holder) and cash in lieu of any
fractional shares, and the Certificate so surrendered will be cancelled. In the
event of a transfer of ownership of shares of Valley Common Stock which is not
registered in the transfer records of Valley, a certificate representing the
proper number of shares of M&I Common Stock may be issued to a transferee if the
Certificate representing such shares of Valley Common Stock is presented to the
Exchange Agent, accompanied by all documents required to evidence and effect
such transfer and by evidence that any applicable stock transfer taxes have been
paid. In the event any Certificate has been lost, stolen or destroyed, upon the
making of an affidavit of that fact by the person claiming such Certificate to
be lost, stolen or destroyed and the payment by such person of a bond in such
reasonable amount as M&I may direct as indemnity against any claim that may be
made against it or the Exchange Agent with respect to such Certificate, the
Exchange Agent will issue in exchange for such lost, stolen or destroyed
Certificate a certificate representing the shares of M&I Common Stock to which
such person is entitled. Until surrendered, each Certificate will, after the
Effective Time, represent only the right to receive upon such surrender a
certificate representing shares of M&I Common Stock and cash in lieu of any
fractional share of M&I Common Stock as described below.
 
     VALLEY SHAREHOLDERS SHOULD NOT FORWARD THEIR STOCK CERTIFICATES TO THE
EXCHANGE AGENT UNTIL THEY RECEIVE A LETTER OF TRANSMITTAL AND INSTRUCTIONS.
 
     No dividends or other distributions declared, made or with a record date
after the Effective Time with respect to M&I Common Stock will be paid to the
holder of any unsurrendered Certificate with respect to the shares of M&I Common
Stock represented thereby, and no cash payment in lieu of fractional shares will
be paid to any such holder, until the holder of such Certificate surrenders such
Certificate. Subject to the effect of applicable laws, following surrender of
any such Certificate, there will be paid to the holder of the certificates
representing whole shares of M&I Common Stock issued in exchange therefor,
without interest, (i) promptly, the amount of any cash payable with respect to a
fractional share of M&I Common Stock to which such holder is entitled and the
amount of dividends or other distributions with a record date after the
Effective Time previously paid with respect to such whole shares of M&I Common
Stock, and (ii) at the appropriate payment date, the amount of dividends or
other distributions, with a record date after the Effective Time but prior to
surrender and a payment date occurring after surrender, payable with respect to
such whole shares of M&I Common Stock.
 
                                       31
<PAGE>   37
 
     All shares of M&I Common Stock issued upon conversion of shares of Valley
Common Stock (including any cash paid for fractional shares) shall be deemed to
have been issued in full satisfaction of all rights pertaining to such shares of
Valley Common Stock, including each Valley Right (as defined below).
 
     No certificates or scrip representing fractional shares of M&I Common Stock
will be issued upon the surrender for exchange of Certificates, and each
fractional share interest will not entitle the owner thereof to vote or to claim
any rights of a shareholder of M&I. Each holder of a fractional share interest
will be paid an amount in cash equal to the product obtained by multiplying such
fractional share interest to which such holder (after taking into account all
fractional share interests then held by such holder) would otherwise be entitled
by the average closing price for a share of M&I Common Stock as quoted on the
NASDAQ/NMS on the five business days immediately preceding the Effective Time.
As soon as practicable after the determination of the amount of cash, if any, to
be paid to holders of fractional share interests, the Exchange Agent will notify
M&I and M&I will make available such amounts to such holders of such fractional
share interests subject to and in accordance with the terms of the Merger
Agreement. It is a condition to consummation of the Merger that the aggregate of
fractional share interests in M&I Common Stock paid in cash pursuant to the
Merger Agreement and the number of shares of M&I Common Stock which would have
been issued pursuant to the Merger Agreement but were not, due to the exercise
of dissenters' rights (if such rights were available), shall not be more than
10% of the maximum aggregate number of shares of M&I Common Stock which could be
issued as a result of the Merger.
 
     Any portion of the Exchange Fund which remains undistributed to the former
shareholders of Valley for six months after the Effective Time will be delivered
to M&I, upon demand, and any former shareholders of Valley who have not complied
with the procedure described above will thereafter look only to M&I for payment
of their claim for M&I Common Stock, any cash in lieu of fractional shares of
M&I Common Stock and any dividends or distributions with respect to M&I Common
Stock.
 
     Neither M&I nor Valley shall be liable to any former holder of shares of
Valley Common Stock for any such shares of former Valley Common Stock (or
dividends or distributions with respect thereto) or cash delivered to a public
official pursuant to any abandoned property, escheat or similar law.
 
     M&I is entitled to deduct and withhold from the consideration otherwise
payable pursuant to the Merger Agreement to any former holder of shares of
Valley Common Stock such amounts as M&I is required to deduct and withhold with
respect to the making of such payment under the Code, or any provision of state,
local or foreign tax law. To the extent that amounts are so withheld by M&I,
such withheld amounts shall be treated for purposes of the Merger Agreement as
having been paid to the former holder of such shares of Valley Common Stock in
respect of which such deduction and withholding was made by M&I.
 
     At the Effective Time, the stock transfer books of Valley shall be closed
and there shall be no further registration of transfers of shares of Valley
Common Stock thereafter on the records of Valley. From and after the Effective
Time, the holders of certificates evidencing ownership of shares of Valley
Common Stock outstanding immediately prior to the Effective Time shall cease to
have any rights with respect to such shares except as otherwise provided in the
Merger Agreement or by law. On or after the Effective Time, any Certificates
presented to the Exchange Agent or M&I for any reason shall be converted into
shares of M&I Common Stock in accordance with the terms of the Merger Agreement
as described above.
 
REPRESENTATIONS AND WARRANTIES
 
     The Merger Agreement contains certain customary representations and
warranties of each of M&I and Valley (and in certain cases also relating to
their respective subsidiaries) relating to, among other things, (a)
organization, regulatory registrations or authorizations and similar corporate
matters; (b) capital structures; (c) authorization, execution, delivery,
performance and enforceability of the Merger Agreement, the Option Agreement and
other related matters; (d) compliance with laws; (e) documents filed with the
Commission, the Federal Reserve Board and other applicable securities or banking
authorities and the accuracy of information contained therein; (f) no material
pending or threatened litigation or governmental investigations or agreements
except as otherwise disclosed in filings with the Commission; (g) retirement and
other employee plans and matters relating to the Employee Retirement Income
Security Act of 1974, as
 
                                       32
<PAGE>   38
 
amended ("ERISA"), and, with respect to Valley, certain matters relating to
employment contracts, options and similar matters; (h) the accuracy of
information supplied by each of M&I and Valley in connection with the
Registration Statement and this Joint Proxy Statement-Prospectus; (i) good title
to properties, free of liens; (j) the absence of certain environmental matters;
(k) the absence of any burdensome contracts, agreements or restrictions; (l)
certain tax matters; (m) with respect to Valley only, certain insurance matters;
(n) absence of certain material changes or events since December 31, 1992,
including changes or events relating to the incurrence of a material adverse
effect in the business, operations, properties (including intangible
properties), condition (financial or otherwise), assets or liabilities
(including contingent liabilities) of M&I and its subsidiaries, taken as a
whole, or of Valley and its subsidiaries, taken as a whole, or since June 30,
1993, a reduction in the consolidated book value of either Valley or M&I; (o) no
action taken that would prevent using the pooling-of-interests method of
accounting for the Merger or which would prevent the Merger from qualifying as a
tax-free reorganization under the Code; (p) material contracts; (q) full
disclosure with regard to all written information furnished pursuant to the
Merger Agreement; (r) opinions of financial advisors; and (s) the shareholder
votes required to approve the Merger Agreement.
 
     The Merger Agreement also contains additional representations and
warranties by Valley to M&I that (a) the Board of Directors of Valley has taken
all actions necessary to ensure that the restrictions of Sections 180.1140-44
and 180.1150 of the WBCL (relating to business combinations with interested
shareholders and other potential restrictions on M&I's ability to consummate the
Merger, generally discussed under "DESCRIPTION OF M&I CAPITAL STOCK -- Certain
Provisions of the Wisconsin Business Corporation Law") do not apply to the
Merger and to amend the Valley Rights Agreement to clarify that neither M&I nor
any affiliate of M&I controlled by M&I will become an "Acquiring Person" and no
"Shares Acquisition Date" or "Distribution Date" (as such terms are defined in
the Valley Rights Agreement) will occur as a result of the Merger Agreement, the
Option Agreement or the transactions contemplated therein, and (b) Valley's
allowance for loan losses is not less than 1.25% of total consolidated loans
reflected on Valley's consolidated financial statements.
 
     The representations and warranties of M&I and Valley contained in the
Merger Agreement are qualified, in certain instances, by materiality standards
contained therein or by the disclosure schedules of M&I and Valley delivered
pursuant to the Merger Agreement.
 
CONDITIONS TO THE MERGER
 
     The Merger Agreement contains certain conditions to the obligations of M&I
and Valley to consummate the Merger. In addition to other customary closing
conditions, the following conditions are contained in the Merger Agreement: (a)
the Merger shall have been approved by the holders of M&I Common Stock and by
the holders of Valley Common Stock and the M&I Articles Amendment shall have
been approved by the holders of M&I Common Stock; (b) the Registration Statement
shall have been declared effective by the Commission under the Securities Act
(and no stop order suspending the effectiveness of the Registration Statement
shall have been issued) and M&I shall also have received all other federal and
state securities permits and authorizations necessary to issue M&I Common Stock
pursuant to the Merger Agreement; (c) the Merger shall have been approved by the
Federal Reserve Board without the imposition of any condition that is not
reasonably satisfactory to M&I or Valley and all conditions required to be
satisfied prior to the Effective Time imposed by such approval shall have been
satisfied and all waiting periods relating to such approval shall have expired;
(d) there shall not be any injunction or restraining order or regulatory
impediment preventing the consummation of the Merger; (e) there shall not be any
pending material action, proceeding or investigation (i) challenging or seeking
material damages in connection with the Merger or (ii) seeking to limit the
exercise of ownership rights by M&I of the business or assets of Valley; (f) the
aggregate of fractional share interests in Valley Common Stock paid in cash
pursuant to the Merger Agreement and the number of shares of M&I Common Stock
which would have been issued pursuant to the Merger Agreement except for the
exercise of dissenters' rights, if available, shall not be more than 10% of the
maximum aggregate number of shares of M&I Common Stock which could be issued as
a result of the Merger; (g) M&I's and Valley's representations and warranties
contained in the Merger Agreement shall be true and correct in all material
respects; (h) all agreements and covenants of each of M&I and Valley required
 
                                       33
<PAGE>   39
to be performed by it under the Merger Agreement shall have been performed by it
in all material respects; (i) all consents, approvals, authorizations or orders
required to be obtained in connection with the Merger by either M&I or Valley
shall have been obtained by it; (j) the opinion of Godfrey & Kahn, S.C. to the
effect that the Merger will be treated for federal income tax purposes as a
"reorganization" within the meaning of Section 368(a) of the Code shall not have
been withdrawn or modified in any material respect; (k) independent counsel to
each party to the Merger Agreement shall have provided the other party with an
opinion of counsel as to certain matters in connection with the Merger; and (l)
each party to the Merger Agreement shall have received from Arthur Andersen &
Co. an opinion to the effect that the Merger qualifies for pooling-of-interests
accounting treatment.
 
     In addition to the mutual conditions discussed above, M&I's obligation to
consummate the Merger is subject to the following additional conditions: (a)
that M&I shall have received from Arthur Andersen & Co. a "comfort letter" with
respect to Valley's financial statements included or incorporated by reference
in this Joint Proxy Statement-Prospectus; (b) that Valley shall have used
reasonable efforts to obtain from each affiliate of Valley a signed letter
regarding certain restrictions on the resale of M&I Common Stock to be received
in the Merger under Rule 145 of the Securities Act; (c) that no governmental
entity shall have taken any action, and no statute, rule or order shall have
been enacted, entered, enforced or deemed applicable to the Merger by any
governmental entity, which would materially adversely impact the economic or
business benefits of the Merger so as to render inadvisable the consummation of
the Merger; (d) that M&I shall have received from all holders of options to
purchase Valley Common Stock (excluding M&I) a waiver of the right to receive
cash in exchange for or upon surrender of any such options in connection with
the Merger; (e) that no "Shares Acquisition Date," "Distribution Date" or
"Triggering Event" (as defined in the Valley Rights Agreement) shall have
occurred; (f) that (i) since September 19, 1993, there has been no material
adverse effect on Valley's financial condition, results of operations or
business and (ii) the average of Valley's quarterly cumulative consolidated net
income for the quarters from the quarter ended September 30, 1993 to the last
quarter reported prior to the Effective Time shall be greater than or equal to
$10,000,000, excluding certain expenses relating to the Merger for purposes of
computing consolidated net income; (g) that the number of shares of Valley
Common Stock outstanding plus the number of shares of Valley Common Stock
subject to issuance pursuant to outstanding stock options (other than pursuant
to the Option held by M&I) shall be not greater than 21,620,942 shares; and (h)
that each of Peter M. Platten, III, Mark L. Miller, Gary A. Lichtenberg, Charles
H. Sauter and Sal A. Troia, officers of Valley, shall have executed a written
agreement to amend certain provisions of the Valley Executive Life Insurance
Plan Agreement between each of such persons and Valley to limit certain coverage
provided under such Agreement.
 
     In addition to the mutual conditions discussed above, Valley's obligation
to consummate the Merger is subject to the condition that the shares of M&I
Common Stock to be issued in the Merger or pursuant to options to purchase M&I
Common Stock to be granted as provided in the Merger Agreement shall have been
approved for listing, upon notice of issuance, on the NASDAQ/NMS.
 
TERMINATION; AMENDMENT AND WAIVER
 
     Termination. The Merger Agreement may be terminated at any time prior to
the Effective Time, whether before or after approval of the matters presented in
connection with the Merger by the holders of M&I Common Stock or Valley Common
Stock at the M&I and Valley Special Meetings: (a) by mutual consent of M&I and
Valley; (b) by either M&I or Valley (i) if there has been a breach in any
material respect of any representation, warranty, covenant or agreement set
forth in the Merger Agreement on the part of M&I, on the one hand, or Valley, on
the other hand, respectively, or (ii) if any representation or warranty of M&I,
on the one hand, or Valley, on the other hand, respectively, shall be discovered
to have become untrue in any material respect, in either case which breach or
other condition has not been cured within 30 business days following receipt by
the nonterminating party of notice of such breach or other condition (provided
that the Merger Agreement may not be terminated by the breaching party or party
making any representation or warranty which shall have become untrue in any
material respect); (c) by either M&I or Valley if any permanent injunction
preventing the consummation of the Merger shall have become final and
nonappealable; (d) by either M&I or Valley if the Merger shall not have been
consummated on or prior to September 19,
                                       34
<PAGE>   40
1994, for a reason other than the failure of the terminating party to comply
with its obligations under the Merger Agreement; provided that if the Merger
shall not have been consummated by September 19, 1994, as a result of
proceedings of a governmental authority or litigation, then the date on which
either M&I or Valley may terminate the Merger Agreement shall be extended to the
earlier of (i) the lapse of a reasonable period of time necessary to consummate
the Merger following the final termination of proceedings of a governmental
authority or litigation or (ii) December 31, 1994; or (e) by either M&I or
Valley if the Federal Reserve Board has denied approval of the Merger, and
neither M&I nor Valley has, within 30 days after the entry of such order denying
approval, filed a petition seeking review of such order as provided by
applicable law.
 
     The Merger Agreement may also be terminated by Valley, during the 10-day
period commencing on the Federal Reserve Board Approval Date, if both of the
following conditions are satisfied: (a) the average of the daily closing prices
of a share of M&I Common Stock as quoted on the NASDAQ/NMS during the period of
10 trading days ending at the end of the third trading day immediately preceding
the Federal Reserve Board Approval Date (the "M&I Average Price") is less than
$18 and (b) the M&I Average Price has declined from the closing price of M&I
Common Stock as reported on the NASDAQ/NMS on September 17, 1993 by more than
15% relative to the decline in the market prices of a selected group of bank
stocks during the same period. The selected group of bank stocks is identified
on Exhibit 8.1 to the Merger Agreement attached as Appendix A to this Joint
Proxy Statement-Prospectus.
 
     In the event of termination of the Merger Agreement by either M&I or
Valley, the Merger Agreement will become void and there will be no liability or
obligation on the part of M&I or Valley other than under certain specified
provisions of the Merger Agreement dealing with confidential treatment of
non-public information and expenses, and other than any liabilities incurred or
suffered by a party as a result of a willful breach of the Merger Agreement. The
Option Agreement will be governed by its own terms with respect to termination.
 
     Amendment and Waiver. Subject to applicable law, (i) the Merger Agreement
may be amended at any time prior to the Effective Time by action taken or
authorized by the respective Boards of Directors of M&I and Valley (except that
after the Merger Agreement is approved by the shareholders of Valley, no
amendment may be made which would reduce the amount or change the type of
consideration into which each share of Valley Common Stock will be converted
pursuant to the terms of the Merger Agreement at the Effective Time) and (ii) at
any time prior to the Effective Time, the parties may extend the time for
performance of the obligations of the other parties to the Merger Agreement, may
waive any inaccuracies in the representations and warranties contained in the
Merger Agreement or any document delivered pursuant thereto or may waive
compliance with any agreements or conditions for their respective benefit
contained in the Merger Agreement.
 
CONDUCT OF BUSINESS PENDING MERGER
 
     The Merger Agreement contains certain affirmative and negative covenants of
M&I and Valley. Pursuant to the Merger Agreement, each party has agreed promptly
to notify the other of any impending or threatened occurrence of an event or
condition which would cause or constitute a material breach of any of its
representations or agreements contained or referred to in the Merger Agreement
and to use its best efforts to prevent or promptly remedy the same. In addition,
Valley has agreed that prior to the Effective Time (without the prior written
consent of M&I), Valley and each of its subsidiaries will (a) operate its
business in the usual, regular and ordinary course consistent with past
practices; (b) use reasonable efforts to preserve intact its business
organization and assets, maintain its rights and franchises, retain the services
of its officers and key employees and maintain its relationships with customers;
(c) use all reasonable efforts to maintain and keep its properties in good
repair and condition; (d) use all reasonable efforts to keep all insurance and
bonds in full force and effect, subject to a premium cap for directors' and
officers' liability insurance; (e) perform in all material respects all
obligations under all material contracts, leases and documents relating to or
affecting its assets, properties and business and (f) comply with and perform in
all material respects all obligations and duties imposed on Valley under all
applicable laws. The Merger Agreement also obligates Valley to exercise
reasonable efforts to retain the listing of Valley Common Stock on the
NASDAQ/NMS at least through the Record Date for the Valley Special Meeting, and
gives M&I the right to designate two representatives to attend and observe
meetings of Valley's senior credit committee.
 
                                       35
<PAGE>   41
 
     Valley has also agreed that prior to the Effective Time (without the prior
written consent of M&I), neither Valley nor any of its subsidiaries will, except
as provided in the Merger Agreement or Option Agreement: (a) (i) grant any
salary increase or bonus increase to any employee with an employment contract,
except pursuant to the terms of the contracts or preexisting formulas and
subject to certain additional limitations, (ii) grant any general salary
increases to employees as a class above certain prescribed limitations, (iii)
effect any change in retirement benefits to any class of employees or any
officer (unless such change is contractually required or otherwise required by
law) which would increase retirement benefit liabilities, (iv) adopt, enter
into, amend or modify any employee benefit plan to increase or accelerate
obligations of Valley or its subsidiaries thereunder or (v) enter into or amend
any employment, severance or similar agreements or arrangements with any
employee, director or officer or otherwise change the employee-at-will status of
any current employee; (b) declare or pay any dividend other than (i) regular
quarterly cash dividends on Valley Common Stock not in excess of $0.24 per share
(provided that in the quarter that the Effective Time occurs, shareholders of
Valley will receive cash dividends only with respect to shares of Valley Common
Stock held or with respect to shares of M&I Common Stock received pursuant to
the Merger Agreement, but not both) or (ii) dividends by a subsidiary of Valley
to Valley; (c) redeem, purchase or otherwise acquire any shares of Valley
capital stock; (d) merge with or into any other corporation or bank or permit
any other corporation or bank to merge into it or consolidate with any other
corporation or bank, or effect any reorganization or recapitalization; (e) other
than in the ordinary course of business and consistent with past practice, (i)
purchase or otherwise acquire any substantial portion of the assets, or more
than 5% of the stock, of any corporation, bank or other business (other than
Pierce County Bank & Trust Company, which Valley acquired as of November 6,
1993) or (ii) liquidate, sell or dispose of, or encumber any assets or acquire
any assets; (f) split, combine, or reclassify any of its capital stock or issue
or authorize or propose the issuance of any other securities in respect of, in
lieu of or in substitution of such capital stock; (g) issue any shares of
Valley's capital stock other than (i) pursuant to outstanding employee stock
options, Valley's dividend reinvestment plan or thrift and sharing plan or (ii)
by a subsidiary of Valley (of its capital stock) to Valley; (h) propose or adopt
any amendment to its articles of incorporation or by-laws in any way adverse to
M&I; (i) purchase any shares of M&I Common Stock (except in a fiduciary capacity
for the account of its customers); (j) change any of its methods of accounting,
or methods of reporting income or deductions for federal income tax purposes, in
effect at December 31, 1992; (k) change any lending, investment, liability
management or other material policies concerning the business or operations of
Valley or any of its subsidiaries, including, without limitation, (i) the
acquisition or sale of any contracts for the purchase or sale of financial or
other futures or any put or call options, or enter into any hedges or interest
rate swaps relating to cash, securities, or any commodities whatsoever or enter
into any derivative transaction, (ii) the sale, assignment, transfer, pledge,
mortgage or encumbrance with respect to any of its assets with a value in excess
of $500,000 individually, (iii) the making of any investment with an interest
maturity of five years or more in excess of $20,000,000, (iv) the incurrence of
any material liabilities or material obligations, whether directly or by way of
guaranty, including any obligation for borrowed money, whether or not evidenced
by a note, bond, debenture or similar instrument, except pursuant to existing
credit agreements and other borrowing facilities filed as exhibits to Valley's
reports to the Commission and which are in the ordinary course of business
consistent with past practice, or otherwise in an aggregate amount of $1,000,000
or less; (l) any agreement with respect to any acquisition of a material amount
of assets or securities or any discharge, waiver, satisfaction, release or
relinquishment of any material contract rights, liens, encumbrances, debt or
claims, not in the ordinary course of business and consistent with past
practices except which together amount to less than $1,000,000; (m) the
settlement of any claim, action, suit, litigation, proceeding, arbitration,
investigation or controversy of any kind, for any amount in excess of $300,000
or in any manner which would restrict in any material respect the operations or
business of Valley or any of its subsidiaries; (n) the purchase of any
derivative securities instrument which involves entering into a contract with a
term of six months or longer; or (o) the taking of any action or failure to take
any action which individually or in the aggregate can be expected to have a
material adverse effect on Valley and its subsidiaries, taken as a whole.
 
     Pursuant to the Merger Agreement, M&I has agreed that prior to the
Effective Time (without the prior written consent of Valley), M&I will (a)
maintain its corporate existence in good standing and maintain all books and
records in accordance with accounting principles and practices as utilized in
M&I's financial
                                       36
<PAGE>   42
statements applied on a consistent basis; and (b) conduct its business in a
manner that does not violate any laws. M&I has also agreed that prior to the
Effective Time (without the prior written consent of Valley), neither M&I nor
any of the M&I subsidiaries will propose or adopt any amendments to its articles
of incorporation or by-laws in any way adverse to Valley.
 
NO SOLICITATION OF TRANSACTIONS
 
     The Merger Agreement provides that Valley and its subsidiaries will not
(without the prior written consent of M&I), initiate, solicit or encourage
(including by way of furnishing information or assistance), or take any other
action to facilitate, any inquiries or the making of any proposal that
constitutes, or may reasonably be expected to lead to, any Competing Transaction
(as defined below), or negotiate with any person in furtherance of such
inquiries or to obtain a Competing Transaction, or agree to or endorse any
Competing Transaction, or authorize or permit any of its officers, directors or
employees or any investment banker, financial advisor, attorney, accountant or
other representative retained by it or any of its subsidiaries to take any such
action. Valley must immediately notify M&I orally, and promptly confirm in
writing, of all of the relevant details relating to all inquiries and proposals
which it may receive relating to any of such matters. Notwithstanding the
foregoing, the Board of Directors of Valley is not prohibited from (a)
furnishing or permitting any of its officers, directors, employees, investment
bankers, financial advisors, attorneys, accountants or other representatives to
furnish information to any party that requests information as to Valley and its
subsidiaries if (i) the Board of Directors of Valley, after consultation with
legal counsel, determines in good faith that such action is required for the
Board of Directors of Valley to comply with its fiduciary duties to shareholders
imposed by law and (ii) prior to furnishing such information to such party,
Valley receives from such party an executed confidentiality agreement in
reasonably customary form (which need not require such party to enter into a
"standstill" agreement) or (b) complying with Rules 14d-2 and 14e-2 promulgated
under the Exchange Act with regard to a Competing Transaction. For this purpose,
"Competing Transaction" means any of the following involving Valley or any of
Valley's subsidiaries: (a) any merger, consolidation, share exchange, business
combination, or other similar transaction; (b) any sale, lease, exchange,
mortgage, pledge, transfer or other disposition of ten percent or more of assets
in a single transaction or series of transactions, excluding from the
calculation of this percentage any such transactions undertaken in the ordinary
course of business and consistent with past practice; (c) any sale of ten
percent or more of shares of capital stock (or securities convertible or
exchangeable into or otherwise evidencing, or any agreement or instrument
evidencing, the right to acquire capital stock); (d) any tender offer or
exchange offer for ten percent or more of outstanding shares of capital stock or
the filing of a registration statement under the Securities Act in connection
therewith; (e) any solicitation of proxies in opposition to any approval by
Valley shareholders of the Merger or the Option Agreement; (f) the filing of an
acquisition application (or the giving of acquisition notice), whether in draft
or final form, under the BHCA or Change in Bank Control Act with respect to
Valley; (g) any person shall have acquired beneficial ownership or the right to
acquire beneficial ownership of, or any "group" (as such term is defined under
Section 13(d) of the Exchange Act and the rules and regulations promulgated
thereunder) shall have been formed which beneficially owns or has the right to
acquire beneficial ownership of, ten percent or more of the then outstanding
shares of capital stock; or (h) any public announcement of a proposal, plan or
intention to do any of the foregoing.
 
STOCK OPTION AGREEMENT
 
     General. Pursuant to the Option Agreement and as a condition for M&I to
enter into the Merger Agreement, Valley has granted to M&I an option (referred
to herein as the Option) to purchase up to 4,045,795 shares of Valley Common
Stock (subject to adjustment for certain dilutive events), but in no event in
excess of 19.9% of the shares of Valley Common Stock issued and outstanding at
the time of exercise, at an exercise price (the "Purchase Price") of $35.75 per
share (the closing price of Valley Common Stock on September 17, 1993, which was
the last trading date preceding execution and delivery of the Merger Agreement
and Option Agreement). The Option may only be exercised by M&I upon the
occurrence of certain triggering and exercise events, discussed below, which
generally relate to control of Valley. None of such events has occurred as of
the date hereof.
 
                                       37
<PAGE>   43
 
     Exercise of Option. The Option may be exercised by M&I, in whole or in
part, at any time and from time to time if both a "Triggering Event" and an
"Exercise Event," each as defined below, have occurred prior to an "Exercise
Termination Event," as defined below, and the Merger Agreement has not been
terminated by Valley for any breach of representations and warranties of M&I.
Any purchase of shares of Valley Common Stock pursuant to the Option is subject
to compliance with all applicable laws, including the BHCA.
 
     For purposes of the Option, a "Triggering Event" is defined as any of the
following events or transactions: (a) Valley or any Valley subsidiary, without
prior written consent of M&I, enters into an agreement to engage in (each an
"Acquisition Transaction") (i) a merger, consolidation, share exchange, or
similar business combination transaction involving Valley or any significant
subsidiary of Valley (as defined by rules of the Commission), (ii) a purchase,
lease or other acquisition of 10% or more of the assets of Valley or any
significant subsidiary of Valley or (iii) a purchase or other acquisition
(including by way of merger, consolidation, share exchange or otherwise) of
securities representing 10% or more of the voting power of Valley or any
significant subsidiary of Valley; (b) any person other than M&I, any M&I
subsidiary or any Valley subsidiary acting in a fiduciary capacity acquires
beneficial ownership ("person" and "beneficial ownership" as used in the Option
Agreement have the meanings defined in the Exchange Act and the rules and
regulations thereunder) or the right to acquire beneficial ownership of, or
commences a tender offer or exchange offer for, 10% or more of the outstanding
Valley Common Stock; (c) any person other than M&I or any M&I subsidiary makes a
bona fide proposal to Valley or its shareholders by public announcement or
written communication, that either is or becomes the subject of public
disclosure, to engage in an Acquisition Transaction; (d) after a proposal is
made by a third party to Valley or its shareholders to engage in an Acquisition
Transaction, Valley breaches any covenant or obligation contained in the Merger
Agreement and such breach (i) entitles M&I to terminate the Merger Agreement and
(ii) has not been cured prior to the date M&I notifies Valley it intends to
exercise the Option; or (e) any person other than M&I or any M&I subsidiary,
other than in connection with a transaction to which M&I has given its prior
written consent, shall have filed an application or notice with the Federal
Reserve Board or the Federal Deposit Insurance Corporation or other federal or
state banking regulatory authority, which application or notice has been
accepted for processing, for approval to engage in an Acquisition Transaction.
 
     For purposes of the Option, an "Exercise Event" is defined as either of the
following: (a) the acquisition by any person of beneficial ownership of 20% or
more of the then outstanding Valley Common Stock or (b) the occurrence of a
Triggering Event of the type specified in subsection (a) of the preceding
paragraph, except that the percentage referred to in clause (iii) of subsection
(a) shall be 20%.
 
     Expiration of the Option. The Option expires upon any of the following: (a)
the Effective Time; (b) termination of the Merger Agreement pursuant to the
provisions thereof prior to the occurrence of a Triggering Event; or (c) 12
months after termination of the Merger Agreement if such termination follows the
occurrence of a Triggering Event, provided that if a Triggering Event continues
beyond or a subsequent Triggering Event occurs after such termination of the
Merger Agreement, the Exercise Termination Event shall be 12 months from
expiration of the last Triggering Event to occur, but no more than 18 months
after such termination of the Merger Agreement. M&I's right to terminate the
Option and to demand payment of the Termination Fee (as defined below) does not
necessarily terminate upon expiration of M&I's right to exercise the Option.
Closing for the purchase of Valley Common Stock pursuant to the exercise of the
option is subject to all required regulatory approvals. In no event may the
closing of a purchase occur more than 18 months after the requisite notice to
purchase such shares is given. In the event, however, that the period for
exercising the right to acquire shares pursuant to the Option Agreement expires
during the pendency of any application to obtain regulatory approval for (a) the
purchase of shares or (b) the payment of the Termination Fee, the period for
exercising the right will be tolled and, if such approval is denied, the holder
has an additional 30 days to exercise its right to receive a Termination Fee or
Registration Rights (as defined below), as the case may be, under the Option
Agreement.
 
     Termination Option. M&I has the right to terminate the Option, to the
extent not exercised, and demand from Valley the Termination Fee, in the
following circumstances: (a) upon the first occurrence of an Exercise Event and
until the occurrence of an Exercise Termination Event or (b) for 30 business
days following (i) M&I's receipt of notice that a regulatory authority will not
issue or grant an approval necessary to the
                                       38
<PAGE>   44
exercise of the Option or (ii) 18 months after the date upon which M&I notifies
Valley that it intended to exercise the Option, if M&I has not closed on the
purchase of such shares pursuant to the Option as a result of a failure to
obtain the necessary regulatory approval.
 
     The Termination Fee (the "Termination Fee") is an amount equal to the
excess, if any, of (a) the Applicable Price (as defined below) for each share of
Valley Common Stock over (b) the Purchase Price (subject to adjustment for
certain dilutive events), multiplied by the number of shares of Valley Common
Stock with respect to which the Option has not been exercised and, where the
Option has been exercised, in whole or in part, but the closing has not
occurred, the number of shares which would have been distributed at such
closing. For purposes of the Option Agreement, "Applicable Price" means the
highest of (a) the highest price at which a tender offer or exchange offer has
been made for shares of Valley Common Stock, (b) the price per share paid by a
third party for shares of Valley Common Stock in connection with a merger or
other business combination, or (c) the highest bid price per share of Valley
Common Stock quoted on the NASDAQ/NMS during the 30 business days prior to M&I's
exercise of its right to receive the Termination Fee.
 
     Registration Rights. M&I has the right within three years of the first
exercise of the Option (or within 30 business days of (a) the denial of
regulatory approval for M&I to purchase shares pursuant to the Option or (b) a
failure to obtain regulatory approval for such purchase during an 18-month
period beginning with the requisite notice of such purchase) to require Valley
to prepare and file up to two registration statements under the Securities Act
for the shares issued or issuable upon exercise of the Option and to use its
best efforts to qualify the shares under any applicable state securities laws if
necessary for M&I to be able to sell the shares (such rights being M&I's
"Registration Rights").
 
     Right of First Refusal. In the event M&I proposes to sell to a third party
the shares acquired by exercise of the Option, Valley has the right, at any time
prior to the later of 24 months after the first exercise of the Option and the
expiration of the Option, to purchase such shares at the price and on the terms
at which M&I proposes to sell such shares to such third party.
 
     Anti-Takeover Effect of the Option Agreement. Certain aspects of the Option
Agreement may have the effect of discouraging persons who might now or prior to
the Effective Time be interested in acquiring all of or a significant interest
in Valley from considering or proposing such an acquisition, even if such
persons were prepared to pay a higher price per share for Valley Common Stock
than the price per share implicit in the Exchange Ratio. The Option granted to
M&I under the Option Agreement is intended to increase the likelihood that the
Merger will be consummated in accordance with the terms of the Merger Agreement.
Certain attempts to acquire Valley or an interest in Valley would cause the
Option to become exercisable as described above, and would trigger M&I's right
to receive any premium offered to holders of Valley Common Stock. This right
would significantly increase the cost of a proposed transaction to a potential
acquiror as compared to the cost it would incur had the Option Agreement not
been entered into. Such increased cost might discourage a potential acquiror
from considering or proposing an acquisition or might result in a potential
acquiror proposing to pay a lower per share price to acquire Valley than it
might otherwise propose to pay. In addition, based on the advice of Arthur
Andersen & Co., the management of Valley believes that exercise of the Option is
likely to prohibit any reasonably foreseeable acquiror of Valley (other than
M&I) from accounting for any acquisition of Valley using the
pooling-of-interests accounting method. Finally, exercise of the Option would
increase the ability of the holder to obtain the approval of the common
shareholders of Valley to consummate the Merger and adversely affect the ability
of a third party to obtain the approval of such common shareholders to
consummate an alternative transaction.
 
MANAGEMENT AND OPERATIONS AFTER THE MERGER
 
     Additional M&I Directors and Officers. Pursuant to the Merger Agreement,
M&I has agreed to appoint four of the current Valley directors to the M&I Board
of Directors at the Effective Time. Three of the four Valley directors to be
appointed to the M&I Board have been agreed upon as of the date hereof, and the
fourth
                                       39
<PAGE>   45
will be agreed upon between M&I and Valley at or prior to the Effective Time.
The three Valley directors who will be appointed to the M&I Board of Directors
and the class to which they will be appointed are as follows:
 
<TABLE>
<CAPTION>
             NAME                               CLASS
             ----                               -----
<S>                              <C>
Peter M. Platten, III.........   Class I (term expiring April, 1997)
Oscar C. Boldt................   Class III (term expiring April, 1996)
Gus A. Zuehlke................   Class III (term expiring April, 1996)
</TABLE>
 
It is anticipated that the fourth appointee to the M&I Board will be a Class II
director with a term expiring in April, 1995.
 
     M&I has also agreed to appoint as officers of M&I at the Effective Time
five of the current Valley officers. The officers of Valley who will become
officers of M&I at the Effective Time and the offices they will hold are as
follows:
 
<TABLE>
<CAPTION>
                                                POSITION WITH
                NAME                                 M&I
                ----                            -------------
<S>                                     <C>
Peter M. Platten, III................   Vice Chairman of the Board
Mark L. Miller.......................   Senior Vice President
Gary A. Lichtenberg..................   Senior Vice President
Charles H. Sauter....................   Senior Vice President
Sal A. Troia.........................   Senior Vice President
</TABLE>
 
Other than the addition of the directors and officers set forth above, no other
changes to the M&I Board of Directors or to M&I's executive officers are
anticipated in connection with the Merger.
 
     M&I Dividend Policy. M&I has no present intention to change its existing
dividend policy. Any M&I dividends are subject to declaration by M&I's Board of
Directors and applicable governmental regulations and policies.
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
     Employment Agreements and Related Matters. In the Merger Agreement, M&I has
agreed to offer employment agreements (the "New Employment Agreements") prior to
the Effective Time to each of Messrs. Platten, Miller, Lichtenberg, Sauter and
Troia, each of whom is currently an officer of Valley; provided, however, that
M&I's commitment to offer the New Employment Agreements to such individuals is
subject to approval by the Commission that qualification of the Merger for
pooling-of-interests accounting treatment will not be adversely affected by such
commitment. As of the date hereof, M&I has received confirmation from the
Commission's staff satisfactory to M&I that offering such agreements to such
individuals will not adversely affect pooling-of-interests accounting treatment
for the Merger. Mr. Platten has declined to accept such employment agreement;
however, M&I has agreed to enter into a change of control agreement with Mr.
Platten. These individuals and certain other officers of Valley have current
employment agreements with Valley entitling them to certain benefits in
connection with a change of control transaction such as the Merger. See "CERTAIN
RELATED TRANSACTIONS -- Employment Agreements and Related Matters."
 
     Indemnification. The Merger Agreement provides that, by virtue of the
occurrence of the Merger, M&I shall from and after the Effective Time succeed to
Valley's obligations with respect to indemnification or exculpation existing at
the time the Merger Agreement was executed in favor of the directors, officers,
employees and agents of Valley and its subsidiaries as provided in the Valley
Articles, Valley By-Laws, indemnification agreements of Valley or its
subsidiaries or otherwise in effect as of the date of the Merger Agreement with
respect to matters occurring prior to the Effective Time.
 
     The Merger Agreement further requires M&I, from and after the Effective
Time, to indemnify, defend and hold harmless each person who is now, or has been
at any time prior to the Effective Time, an officer, director or employee of
Valley or any Valley subsidiary against (i) all losses, claims, damages, costs,
expenses, liabilities or judgments or amounts that are paid in settlement with
the approval of M&I of or in connection
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<PAGE>   46
with any claim, action, suit, proceeding or investigation based in whole or in
part on or arising in whole or in part out of the fact that such person is or
was a director, officer or employee of Valley or any Valley subsidiary, whether
pertaining to any matter existing or occurring at or prior to the Effective Time
and whether asserted or claimed prior to, at or after, the Effective Time
("Indemnified Liabilities") and (ii) all Indemnified Liabilities which are based
upon, arise out, or in any way relate to the Merger Agreement or the
transactions contemplated thereby, in each case to the full extent Valley would
have been permitted under Wisconsin law and the Valley Articles and By-Laws to
indemnify such person. M&I must pay expenses in advance of the final disposition
of any such action or proceeding to each indemnified party to the full extent
permitted by law.
 
     If any such claim, action, suit, proceeding or investigation is brought
against an indemnified party (whether arising before or after the Effective
Time), (i) any counsel retained by the indemnified parties after the Effective
Time shall be reasonably satisfactory to M&I; (ii) after the Effective Time, M&I
shall pay all reasonable fees and expenses of such counsel promptly; and (iii)
after the Effective Time, M&I will use all reasonable efforts to assist in the
vigorous defense of any such matter, provided that M&I is not liable for any
settlement effected without its written consent. The indemnified parties as a
group may retain only one law firm to represent them with respect to each such
matter unless there is a conflict on any significant issue between the positions
of any two or more indemnified parties.
 
     M&I is obligated pursuant to the Merger Agreement for a period of three
years after the Effective Time to maintain in effect current directors' and
officers' liability insurance policies maintained by Valley, or to substitute
comparable policies providing at least the same coverage, with respect to claims
arising from facts or events occurring before the Effective Time. M&I is not
obligated to make annual premium payments for such insurance to the extent the
premiums thereon exceed 250% of the premiums paid by Valley for said insurance
as of the date of the Merger Agreement.
 
EFFECT ON EMPLOYEE BENEFITS AND STOCK OPTIONS
 
     In the Merger Agreement, M&I and Valley have agreed to take certain actions
in connection with employee benefit plans and related matters. It is the general
intention of such agreements to provide employees of Valley and its subsidiaries
who continue as employees of M&I after the Effective Time ("Continuing
Employees") with retirement and welfare benefits which are comparable to those
provided to other similarly situated employees of M&I and its subsidiaries.
Continuing Employees will have their years of service with Valley and its
subsidiaries generally recognized for M&I employee benefit purposes, subject to
special rules with respect to the Valley Bancorporation Health Plan.
 
     At the Effective Time, each outstanding option to purchase shares of Valley
Common Stock ("Valley Stock Option") will be assumed by M&I. Each Valley Stock
Option will be deemed to constitute an option to acquire, on the same terms and
conditions as were applicable under such Valley Stock Option, the number of
shares of M&I Common Stock equal to the product of the Exchange Ratio and the
number of shares subject to such option, at an exercise price per share equal to
the aggregate exercise price for the shares subject to such option divided by
the number of shares of M&I Common Stock purchasable pursuant to such option.
 
     The Valley Stock Options contain a right to receive cash upon surrender of
the Stock Options to Valley, within sixty (60) days prior to the Merger, in
exchange for a cash payment equal to the difference between the fair market
value of the Valley Common Stock subject to the Stock Options at the time of
surrender and the exercise price thereof. It is a condition to M&I's obligation
to consummate the Merger that Valley shall have provided M&I with evidence that
all holders of Valley Stock Options shall have waived any such right to receive
cash upon surrender of any such option as such right relates to the Merger. As
of the date hereof, such waivers had been received from all holders of Valley
Stock Options.
 
ACCOUNTING TREATMENT
 
     The Merger is intended to qualify as a pooling-of-interests for accounting
and financial reporting purposes. Under the pooling-of-interests method of
accounting, the historical basis of the assets and liabilities of M&I and Valley
will be retroactively combined for the entire fiscal period in which the Merger
occurs and for all periods prior to the Merger at historically recorded amounts.
Consummation of the Merger is
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<PAGE>   47
conditioned upon receipt by M&I and Valley of an opinion from Arthur Andersen &
Co. to the effect that the Merger qualifies for pooling-of-interests accounting
treatment if consummated in accordance with the terms of the Merger Agreement.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
     The following is a summary of the material federal income tax consequences
of the Merger. This summary may not be applicable to Valley shareholders who
acquired shares of Valley Common Stock pursuant to stock option plans or
otherwise as compensation or to Valley shareholders having special
circumstances. The summary is provided for general informational purposes only
and does not include consequences of foreign, state, local or other tax laws.
Because each Valley shareholder's tax circumstances may differ, each Valley
shareholder should consult such shareholder's personal tax advisor as to the tax
consequences of the Merger under federal, state, local or other applicable laws.
 
     M&I and Valley have received an opinion dated December 28, 1993 from
Godfrey & Kahn, S.C., Milwaukee, Wisconsin, to the effect that the Merger will
be treated for federal income tax purposes as a reorganization within the
meaning of Section 368(a) of the Code based on customary assumptions and
representations, and consummation of the Merger is conditioned on such opinion
not having been withdrawn or modified in any material respect. Based in part on
such assumptions and representations, Godfrey & Kahn, S.C., is of the opinion
that under currently applicable law: (a) the Merger will constitute a
reorganization within the meaning of Section 368(a) of the Code, (b) no gain or
loss will be recognized by the shareholders of Valley upon their receipt of M&I
Common Stock on conversion of their Valley Common Stock in the Merger, except as
discussed below for cash received in lieu of fractional shares, (c) the tax
basis of the shares of M&I Common Stock received by shareholders of Valley will
be the same as the tax basis of their converted Valley Common Stock, reduced by
any amount allocable to any fractional share interest for which cash is
received, and (d) the holding period of the shares of M&I Common Stock received
by Valley shareholders in the Merger will include the holding period of the
shares of Valley Common Stock received in the Merger, provided the shares of
Valley Common Stock are held as a capital asset at the Effective Time.
 
     A Valley shareholder entitled to receive cash in lieu of a fractional share
of M&I Common Stock in connection with the Merger will recognize gain (or loss)
equal to the difference between such cash amount and the shareholder's basis in
the fractional share. Any gain (or loss) recognized will be a capital gain (or
loss) if the shares of Valley Common Stock are held as a capital asset at the
Effective Time.
 
RESALE OF M&I COMMON STOCK BY AFFILIATES
 
     The shares of M&I Common Stock to be issued to former shareholders of
Valley upon consummation of the Merger have been registered under the Securities
Act. Such shares may be traded freely and without restriction by those
shareholders not deemed to be "affiliates" (as such term is defined under the
Securities Act) of Valley. "Affiliates" are generally defined as persons who
control, are controlled by, or are under common control with Valley.
Accordingly, "affiliates" will generally include directors and executive
officers of Valley. Shares of M&I Common Stock received by those shareholders of
Valley deemed to be "affiliates" may not be sold without registration, except as
permitted by Rules 145 and 144 under the Securities Act, or as otherwise
permitted under the Securities Act. This Joint Proxy Statement-Prospectus does
not cover resales of any M&I Common Stock received by "affiliates" of Valley.
Valley has agreed to use reasonable efforts to cause each person identified as
an affiliate of Valley to enter into an agreement which provides that such
affiliate will not transfer any M&I Common Stock received in the Merger except
in compliance with the Securities Act and will make no disposition of any M&I
Common Stock or Valley Common Stock (or any interest therein) during the period
commencing 30 days prior to the Effective Time through the date on which
financial results covering at least 30 days of combined operations of M&I and
Valley after the Merger have been published.
 
                                       42
<PAGE>   48
 
NO APPRAISAL OR DISSENTERS' RIGHTS
 
     Under Section 180.1302(4) of the WBCL, subject to certain exceptions
inapplicable to the Merger, holders of shares of a Wisconsin corporation quoted
on the NASDAQ/NMS on the record date fixed to determine shareholders entitled to
notice of a shareholders meeting at which shareholders are to vote on a merger
are not entitled to appraisal or dissenters' rights. The M&I Common Stock and
the Valley Common Stock were quoted on the NASDAQ/NMS as of the M&I Record Date
and Valley Record Date, respectively. Accordingly, holders of both M&I Common
Stock and Valley Common Stock have no appraisal or dissenters' rights with
respect to the Merger.
 
                          CERTAIN RELATED TRANSACTIONS
 
VALLEY RIGHTS AGREEMENT AMENDMENT
 
     Valley has amended the Valley Rights Agreement so as to provide that (a)
neither M&I nor any affiliate of M&I shall be deemed an Acquiring Person (as
defined in the Valley Rights Agreement), and (b) the execution, delivery and
performance of the Merger Agreement and the Option Agreement does not and will
not result in a Shares Acquisition Date or Distribution Date (as such terms are
defined in the Valley Rights Agreement), provided that M&I and its affiliates
acquire Valley Common Stock only in the manner specified in the Valley Rights
Agreement Amendment. Furthermore, at the Effective Time, all shares of M&I
Common Stock issued upon conversion of Valley Common Stock shall be deemed to
have been issued in full satisfaction of all rights pertaining to such shares of
Valley Common Stock, including each Valley Right. See "COMPARISON OF SHAREHOLDER
RIGHTS -- Shareholder Rights Plan."
 
EMPLOYMENT AGREEMENTS AND RELATED MATTERS
 
     New Employment Agreements and Related Matters. In the Merger Agreement, M&I
has agreed to offer employment agreements (referred to collectively herein as
the New Employment Agreements) prior to the Effective Time to each of Messrs.
Platten, Miller, Lichtenberg, Sauter and Troia, each of whom is currently an
officer of Valley. Mr. Platten has declined to accept such an agreement, so as
to be employed by M&I following the Merger on the same basis as other M&I senior
executives, who have change of control agreements (as discussed below) but do
not have employment agreements. The compensation to be provided to Mr. Platten
will be that which he would have received had he entered into the employment
agreement offered to him. By virtue of declining an employment agreement, Mr.
Platten's employment status with M&I will be that of an employee at will,
subject to his rights under his change of control agreement. Each of the New
Employment Agreements has a term of two years from the Effective Time and is not
terminable by M&I except (1) upon the employee's death or disability or (2) for
"cause." For purposes of the New Employment Agreements, "cause" means (i) the
employee's failure to perform his obligations to M&I in any material respect
after written demand for performance is delivered to the employee and the
employee has not cured such failure within 30 days of such written demand, (ii)
the employee's use of alcohol, drugs or other illegal substances in such a
manner as to interfere with the performance of his obligations under his
employment agreement in any material respect, (iii) any willful act of
misconduct by the employee which is or reasonably could be materially injurious
to M&I, monetarily or otherwise, (iv) certain criminal acts by the employee
involving willful acts of dishonesty, breach of trust, or violation of the
banking laws or conviction of a felony that impairs the employee's ability to
perform his obligations under his employment agreement, or (v) the employee's
willful violation of the confidentiality provisions of his employment agreement.
The base annual salaries set pursuant to the New Employment Agreements are as
follows: Mr. Miller -- $180,000, Mr. Lichtenberg -- $175,000, Mr. Sauter --
$160,000, and Mr. Troia -- $135,000. Mr. Platten will receive a salary which is
the same as that of the President of M&I, which is currently $375,000. The New
Employment Agreements also set minimum annual bonuses as follows: Mr. Miller --
$50,000, Mr. Lichtenberg -- $50,000, Mr. Sauter -- $45,000, and Mr. Troia --
$35,000. Mr. Platten will receive the same bonus as that received by the
President of M&I (which was $225,000 in respect of 1992.) The New Employment
Agreements also require M&I to grant non-qualified options to purchase shares of
M&I Common Stock within 30 days of the Effective Time as follows: Mr. Miller --
20,000 shares, Mr. Lichtenberg -- 40,000 shares, Mr. Sauter --
                                       43
<PAGE>   49
 
40,000 shares, and Mr. Troia -- 20,000 shares. M&I will grant Mr. Platten an
option to purchase 100,000 shares of M&I Common Stock. All such options will
have an exercise price per share equal to the market price per share of M&I
Common Stock on the date of grant; 50% of the options will vest 12 months after
the date of grant and an additional 25% will vest on the dates 18 months and 24
months after the date of grant. All such options will expire ten years from the
date of grant. See "1993 Executive Stock Option Plan." The New Employment
Agreements also provide for fringe benefits generally provided to senior
executives of M&I. M&I has also agreed to provide Gus A. Zuehlke, Chairman of
Valley, with a car, a $100,000 annual consulting fee for life, office space and
membership in a certain professional organization.
 
     M&I has an understanding with Mr. Platten that he will continue to receive
various fringe benefits he received as President of Valley, including
memberships in certain professional and social organizations. M&I has also
agreed to enter into a change of control agreement (the "Change of Control
Agreement") with Mr. Platten, as of the Effective Time, containing terms
substantially similar to existing agreements between M&I and certain of its
current executive officers. The Change of Control Agreement guarantees Mr.
Platten specific payments and benefits upon a termination of employment as a
result of a change of control of M&I. If a change of control occurs, the
contract becomes effective and continues for a three-year employment term. The
employment term renews on a daily basis until M&I gives notice to terminate the
daily renewal. The Change of Control Agreement provides for specified benefits
after a change of control if Mr. Platten voluntarily terminates for "good
reason" or is involuntarily terminated other than for "cause" (as defined in the
Change of Control Agreement). In addition, for a period of 60 days starting at
the end of six months after a change of control, Mr. Platten may terminate
employment for any reason and is entitled to receive full benefits. Upon a
termination, Mr. Platten is entitled to (a) a lump sum payment equal to three
times the sum of Mr. Platten's then-current base salary plus the higher of Mr.
Platten's bonus for the last year or Mr. Platten's average bonus for the past
three years, (b) a proportionate amount of any unpaid bonus deemed earned for
the year of termination, (c) a lump sum payment equal to the M&I retirement
benefits lost as a result of not having been employed for an additional
three-year period, (d) M&I health and other benefits for at least three years
from the date of termination, and (e) payments for certain other M&I fringe
benefits. In the event of a termination of employment as a result of his death,
Mr. Platten's beneficiary is entitled to six months of M&I base salary and a
proportionate amount of any unpaid bonus deemed earned for such year. In the
event of a termination of employment as a result of his disability, Mr. Platten
is entitled to receive a proportionate amount of any unpaid bonus earned for the
year of termination. No additional benefits are guaranteed under the Change of
Control Agreement upon Mr. Platten's termination by M&I for cause. The Change of
Control Agreement provides that upon a change of control most restrictions
limiting the exercise, transferability or other incidents of ownership of any
outstanding award, restricted stock, stock options, stock appreciation rights,
or other property rights of M&I granted to Mr. Platten shall lapse, and such
awards shall become fully vested, except in certain circumstances. The Change of
Control Agreement also provides for "gross-up" payments in the event payments to
Mr. Platten under the Change of Control Agreement are subject to Section 4999 of
the Code (the "Excise Tax") or any similar federal, state or local tax which may
be imposed, in an amount such that the net amount retained by Mr. Platten, after
deduction of any Excise Tax on the payments and any federal, state and local
income tax and Excise Tax upon the gross-up payment, shall be equal to the
payments then due.
 
     Existing Employment Agreements and Related Matters. Valley has employment
contracts with certain of its employees, including employment contracts with
Messrs. Platten, Miller, Lichtenberg, Sauter and Troia (such contracts for the
named individuals are collectively referred to as the "Existing Employment
Agreements"), which provide for the payment of certain amounts as a result of a
"change of control termination," including a termination (or in certain events,
a resignation) in connection with the Merger. In the Merger Agreement, M&I has
agreed that notwithstanding the continued employment by M&I of Messrs. Platten,
Miller, Lichtenberg, Sauter and Troia, each of such individuals may, at his
election made after the Effective Time, be treated as if a "change of control
termination" occurred under his Existing Employment Agreement, and the date of
such election shall be deemed the "Termination Date" for purposes of such
agreement. It is contemplated that M&I and each of such individuals will agree
that, subject to certain conditions, such election will be considered to have
been made and will be effective at the Effective Time. The effect of a "change
of control termination" would be to entitle each such individual to substantial
payments
 
                                       44
<PAGE>   50
under the Existing Employment Agreements as follows: (i) a lump sum severance
payment equal to three (3) times the sum of (a) the executive's current annual
base salary plus (b) the average of his annual cash bonuses, if any, for the
past three (3) years; (ii) certain benefits and perquisites, as set out in the
Existing Employment Agreements, or, if unavailable, the cash equivalent thereof
for the three (3) years following the Termination Date; and (iii) an enhanced
supplemental pension benefit, defined as the "Contract Benefit" in the Existing
Employment Agreements, which commences at the later of (a) three years after the
Termination Date or (b) when the executive reaches age 50 and ends on (y) the
death of the last to die of the executive or his spouse, if the executive is
married when the Contract Benefit commences or (z) the death of the executive,
if he is single at that time. The Contract Benefit equals the total pension
benefit amount that would be payable to the executive in the form of a monthly
pension for the remainder of his lifetime from the Valley Pension Plan, a
tax-qualified defined benefit plan, and the Valley Excess Benefits Plan, a
non-tax-qualified deferred compensation plan, calculated as if the executive
were age 65 and had continued in the employ of Valley until that age at the same
level of compensation payable to him immediately prior to the Termination Date.
Once payments to the Executive commence under the Valley Pension Plan and the
Excess Benefits Plan, the Contract Benefit is reduced thereby. The approximate
amounts payable to the executives under the Existing Employment Agreements,
discounted (where appropriate) at a six (6) percent interest rate, compounded
annually and the Valley Executive Life Insurance Plan, discussed below, are
approximately as follows: Mr. Platten -- $3.3 million, Mr. Miller -- $1.9
million, Mr. Lichtenberg -- $2.0 million, Mr. Sauter -- $1.7 million, and Mr.
Troia -- $1.1 million. If four other officers of Valley, Messrs. Richard H.
Jones (Executive Vice President/Northern Division), John F. Mack (Executive Vice
President/Southern Division), John W. Johnson (Senior Vice President/West
Region) and Jerome F. Kolbe (Senior Vice President/Investments/ALCO), are
subject to a "change of control termination" under their employment contracts,
the aggregate amounts payable pursuant to such contracts would be approximately
$6.3 million, calculated in the same manner as above. The four officers
identified in the preceding sentence will be subject to a "change of control
termination" if they leave the employ of M&I (as successor to Valley) within 12
months of the completion of the Merger. It is contemplated that some or all of
such officers may agree with M&I that their employment will terminate at the
Effective Time and that, subject to certain conditions, such termination will be
treated as a "change of control termination." In addition, each of the
employment contracts, including the Existing Employment Agreements, provides for
an increase in the amounts payable to offset fully, on an after-tax basis, the
amount of any golden parachute excise tax owed in connection with the payment of
the amounts set forth above. The computation of the gross-up for the golden
parachute excise tax depends on factors which are not quantifiable at this time
(including the applicable discount rate prescribed by the Internal Revenue
Service for the month in which the Merger occurs).
 
     Under the Valley Executive Life Insurance Plan, thirteen Valley executives,
including Messrs. Platten, Miller, Lichtenberg, Sauter, and Troia, are entitled
to receive a paid-up life insurance policy providing life insurance coverage for
the Executive's lifetime equal to 2 1/2 times base compensation pre-retirement
and one times base compensation post-retirement assuming retirement at age 65
with salary increases at 6% to age 65. The premium to purchase the policy must
be paid no later than 60 days after the Merger. Furthermore, if the payment of
the premium would result in taxable income to the executive, the executive will
receive a payment to offset fully, on an after-tax basis, any federal and state
income taxes owing in connection with the premium payment. It is a condition to
the Merger that Messrs. Platten, Miller, Lichtenberg, Sauter and Troia agree to
limit the life insurance coverage provided under the Valley Executive Life
Insurance Plan to one times base compensation for 1993 for both pre-and
post-retirement. If each such executive agrees to the limitation, the value of
the additional premium to purchase such a policy and the federal and state
income tax gross-up, assuming the existing cash surrender value of the policy
and the additional premium will be taxable income to the executive, is
approximately as follows: Mr. Platten -- $124,000, Mr. Miller -- $51,000, Mr.
Lichtenberg -- $73,000, Mr. Sauter -- $57,000, and Mr. Troia -- $76,000. These
amounts are included in the amounts shown above for each of these individuals.
 
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<PAGE>   51
 
                       CERTAIN REGULATORY CONSIDERATIONS
 
     The Merger is subject to the approval of the Federal Reserve Board under
Sections 3 and 4 of the BHCA and the OTS under Section 10 of the HOLA. M&I filed
the necessary applications with these regulatory authorities in December 1993.
 
FEDERAL RESERVE BOARD APPROVAL
 
     Section 3 of the BHCA requires that the Federal Reserve Board take into
consideration, among other factors, the financial and managerial resources and
future prospects of the institutions and the convenience and needs of the
communities to be served. The BHCA prohibits the Federal Reserve Board from
approving the Merger (i) if it would result in a monopoly or be in furtherance
of any combination or conspiracy to monopolize or to attempt to monopolize the
business of banking in any part of the United States or (ii) if its effect in
any section of the country may be substantially to lessen competition or to tend
to create a monopoly, or if it would in any other manner be a restraint of
trade, unless the Federal Reserve Board finds that the anti-competitive effects
of the Merger are clearly outweighed by the public interest and the probable
effect of the transaction in meeting the convenience and needs of the
communities to be served. The Community Reinvestment Act of 1978 also requires
that the Federal Reserve Board, in deciding whether to approve the Merger,
assess the record of performance of the bank subsidiaries of M&I and Valley in
meeting the credit needs of the entire community, including low-and
moderate-income neighborhoods, served by such bank subsidiaries. The Federal
Reserve Board has also indicated that it will not approve a significant
acquisition unless the resulting institution has adequate regulatory capital,
taking into account, among other things, the nature of the business and
operations and plans for expansion.
 
     Under Section 4 of the BHCA and related regulations, the Federal Reserve
Board must assess whether the performance of M&I's and Valley's nonbanking
activities on a combined basis can reasonably be expected to produce benefits to
the public such as greater convenience, increased competition, or gains in
efficiency, that outweigh any possible adverse effects, such as undue
concentration of resources, decreased or unfair competition, conflicts of
interest and unsound banking practices. This assessment also includes an
evaluation of the financial and managerial resources of M&I and Valley and the
effect of the Merger on those resources.
 
     Pursuant to the BHCA, the Merger may not be consummated until the 30th day
following the date of Federal Reserve Board approval, during which time the
United States Department of Justice may challenge the Merger on antitrust
grounds. The commencement of an antitrust action would stay the effectiveness of
the Federal Reserve Board's approval unless a court specifically orders
otherwise.
 
     M&I and Valley believe that while divestitures will be required in one or
more of the markets served by M&I and Valley, antitrust concerns are not
expected to preclude the consummation of the Merger. The Federal Reserve Board
generally evaluates the possible anti-competitive effects of a bank merger or
acquisition by measuring the effect of the merger or acquisition on market share
concentration, utilizing branch deposits as the indicator of a bank's market
share in a local geographic market (such as a metropolitan area or county). If
the deposit market share data for a geographic market indicates that the overall
concentration in that market is above a specified level and the merger or
acquisition causes the concentration to increase by a specified amount, the
Federal Reserve Board has in the past generally required the divestiture of
certain banking operations, although there have also been occasions where
mergers or acquisitions were approved notwithstanding the presence of combined
market shares in excess of such specified levels. The Federal Reserve Board also
evaluates other aspects of the possible anti-competitive effects of the merger
or acquisition. Based on the treatment of prior mergers and acquisitions
involving other parties, M&I anticipates that certain divestitures may be
required by the Federal Reserve Board or the Department of Justice, and M&I has
filed applications with the Federal Reserve Board proposing the divestiture of
certain bank branches in the State of Wisconsin. At the present time, M&I
management has preliminarily identified branches with total deposits of
approximately $324 million as candidates for divestiture. There can be no
assurance as to the location and amount of divestitures that will ultimately be
required in connection with regulatory approval of the Merger. The Federal
Reserve Board has in the past generally required that any divestitures be made
prior to the consummation of the merger with respect to which approval is
sought. If the Federal Reserve Board adheres to this practice with respect to
the Merger, consummation of the Merger would be delayed until any required
divestitures are completed.
 
                                       46
<PAGE>   52
 
OTS APPROVAL
 
     As a result of Valley's control of two savings associations, Valley is a
registered savings and loan holding company under HOLA and is subject to OTS
regulation, supervision and reporting requirements. Section 10 of the HOLA
requires that the OTS take into consideration, among other factors, the
financial and managerial resources and future prospects of the institutions, the
effect of the acquisition on the savings associations, the insurance risk to the
Savings Association Insurance Fund or the Bank Insurance Fund and the
convenience and needs of the communities to be served. The HOLA prohibits the
OTS from approving the Merger (i) if it would result in a monopoly or be in
furtherance of any combination or conspiracy to monopolize or to attempt to
monopolize the savings and loan business in any part of the United States or
(ii) if its effect in any section of the country may be substantially to lessen
competition or to tend to create a monopoly, or if it would in any other manner
be a restraint of trade, unless the OTS finds that the anti-competitive effects
of the Merger are clearly outweighed by the public interest and the probable
effect of the transaction in meeting the convenience and needs of the
communities to be served. Since M&I presently controls no savings associations,
anti-competitive concerns are not expected to be raised by the OTS as a result
of M&I's acquisition of control of the two savings associations presently owned
by Valley.
 
     It is anticipated that the regulatory approvals described above will be
obtained by not later than June 30, 1994, but no assurance can be given as to
when or if regulatory approvals will be obtained, or that, if obtained, they
will not contain conditions so burdensome as to cause Valley or M&I or both to
conclude that the anticipated benefits of the Merger cannot reasonably be
obtained and that the Merger Agreement therefore should be terminated, or that
the other conditions to the Merger will be satisfied or waived so as to permit
consummation of the Merger. As described under "THE MERGER -- Termination;
Amendment and Waiver," if the Effective Time has not occurred by September 19,
1994, or, at the latest, December 31, 1994 if the delay is a result of
proceedings of a governmental authority or litigation related to the Merger,
each of M&I and Valley will have the right to terminate the Merger Agreement.
 
               PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS
 
     The following (i) unaudited pro forma combined condensed balance sheet for
M&I and its consolidated subsidiaries and Valley and its consolidated
subsidiaries as of September 30, 1993 assuming the Merger had been consummated
on September 30, 1993 and (ii) unaudited pro forma combined condensed statements
of income for M&I and Valley for the nine months ended September 30, 1993 and
1992 and for the three years ended December 31, 1992, give effect to the Merger
as if it had been consummated on January 1, 1990, and in each case accounted for
as a pooling-of-interests. See "THE MERGER -- Accounting Treatment." The
consummation of the Merger is dependent upon obtaining regulatory approvals,
which may necessitate divestitures of certain bank branches. The ultimate
composition of the divestitures has not been finalized, and accordingly no
adjustment for divestitures has been included in the unaudited pro forma
combined condensed financial statements. However, at the present time M&I
management has preliminarily identified branches with total deposits of
approximately $324 million as candidates for divestiture. There can be no
assurance, however, as to the amount of divestiture that will ultimately be
required in connection with regulatory approval of the Merger.
 
     The following information should be read in conjunction with and is
qualified in its entirety by the consolidated financial statements and
accompanying notes of M&I and Valley included in the documents described under
"INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE."
 
     The Pro Forma Combined Condensed Financial Statements are intended for
information purposes and are not necessarily indicative of the future financial
position or future results of the combined company or of the financial position
or the results of operations of the combined company that would have actually
occurred had the Merger been in effect as of the date or for the periods
presented.
 
                                       47
<PAGE>   53
 
                  PRO FORMA COMBINED CONDENSED BALANCE SHEETS
 
                               SEPTEMBER 30, 1993
 
                                 (In thousands)
 
<TABLE>
<CAPTION>
                                                                                                PRO FORMA      PRO FORMA
                                                     M&I          VALLEY       COMBINED        ADJUSTMENTS    COMBINED(2)
                                                  ----------    ----------    -----------      -----------    ------------
<S>                                               <C>           <C>           <C>              <C>            <C>
ASSETS
Cash and cash equivalents:
  Cash and due from banks......................   $  418,784    $  173,335    $   592,119          --         $   592,119
  Other cash equivalents.......................      167,442         1,486        168,928          --             168,928
                                                  ----------    ----------    -----------      -----------    ------------
Cash and cash equivalents......................      586,226       174,821        761,047          --             761,047
Other short-term investments...................       68,786           662         69,448          --              69,448
Investment securities:
  US Treasury and government agencies..........    1,509,868       498,684      2,008,686          --           2,008,686
  States and political subdivisions............      195,987       199,983        395,970          --             395,970
  Other........................................       45,459       225,212        270,537          --             270,537
                                                  ----------    ----------    -----------      -----------    ------------
Investment securities..........................    1,751,314       923,879      2,675,193          --           2,675,193
Loans:
  Commercial loans and leases..................    2,119,667       718,881      2,838,548          --           2,838,548
  Real estate..................................    2,420,604     1,793,921      4,214,525          --           4,214,525
  Personal.....................................      674,045       623,512      1,297,557          --           1,297,557
                                                  ----------    ----------    -----------      -----------    ------------
                                                   5,214,316     3,136,314      8,350,630          --           8,350,630
  Less: Allowance for loan losses..............       92,005        39,657        131,662          --             131,662
                                                  ----------    ----------    -----------      -----------    ------------
Net loans......................................    5,122,311     3,096,657      8,218,968          --           8,218,968
Premises and equipment, net....................      185,359       101,608        286,967          --             286,967
Accrued interest and other assets..............      196,166        95,949        292,115          --             292,115
                                                  ----------    ----------    -----------      -----------    ------------
Total Assets...................................   $7,910,162    $4,393,576    $12,303,738          --         $12,303,738
                                                  ----------    ----------    -----------      -----------    ------------
                                                  ----------    ----------    -----------      -----------    ------------
LIABILITIES AND SHAREHOLDERS' EQUITY
Deposits:
  Noninterest bearing..........................   $1,571,814    $  515,108    $ 2,086,922          --         $ 2,086,922
  Interest bearing.............................    4,435,131     3,212,877      7,648,008          --           7,648,008
                                                  ----------    ----------    -----------      -----------    ------------
Total deposits.................................    6,006,945     3,727,985      9,734,930          --           9,734,930
Short-term borrowings..........................      744,481       182,622        927,103          --             927,103
Long-term borrowings...........................      208,736        53,267        262,003          --             262,003
Accrued expenses and other liabilities.........      172,485        79,292        251,777(4)    $  48,000         299,777
                                                  ----------    ----------    -----------      -----------    ------------
Total Liabilities..............................    7,132,647     4,043,166     11,175,813          48,000      11,223,813
Shareholders' Equity:
  Preferred stock..............................          185        --                185          --                 185
  Common stock.................................       66,391        10,171         76,562(1)       24,818         101,380
  Additional paid-in capital...................       46,675       204,901        251,576(1)      (24,818)        226,758
  Retained earnings............................      733,799       135,338        869,137(4)      (48,000)        821,137
                                                  ----------    ----------    -----------      -----------    ------------
                                                     847,050       350,410      1,197,460         (48,000)      1,149,460
  Less:
    Treasury common stock, at cost.............       67,394        --             67,394          --              67,394
    Deferred compensation......................        2,141        --              2,141          --               2,141
                                                  ----------    ----------    -----------      -----------    ------------
Total Shareholders' Equity.....................      777,515       350,410      1,127,925         (48,000)      1,079,925
                                                  ----------    ----------    -----------      -----------    ------------
Total Liabilities and Shareholders' Equity.....   $7,910,162    $4,393,576    $12,303,738       $       0     $12,303,738
                                                  ----------    ----------    -----------      -----------    ------------
                                                  ----------    ----------    -----------      -----------    ------------
</TABLE>
 
         See Notes to Pro Forma Combined Condensed Financial Statements
 
                                       48
<PAGE>   54
 
                 PRO FORMA COMBINED CONDENSED INCOME STATEMENTS
 
                      NINE MONTHS ENDED SEPTEMBER 30, 1993
 
                     (In thousands, except per share data)
 
<TABLE>
<CAPTION>
                                                                                                          PRO FORMA
                                                                                 M&I         VALLEY      COMBINED (2)
                                                                               --------     --------     ------------
<S>                                                                            <C>          <C>          <C>
INTEREST INCOME:
  Loans......................................................................  $285,880     $196,294       $482,174
  Investment securities:
    Taxable..................................................................    65,932       28,935         94,867
    Exempt from Federal income taxes.........................................    10,191        7,674         17,865
  Short-term investments.....................................................     4,566          226          4,792
                                                                               --------     --------     ------------
Total interest income........................................................   366,569      233,129        599,698
INTEREST EXPENSE:
  Deposits...................................................................   110,964       95,134        206,098
  Short-term borrowings......................................................    12,711        2,336         15,047
  Long-term borrowings.......................................................    11,503        5,371         16,874
                                                                               --------     --------     ------------
Total interest expense.......................................................   135,178      102,841        238,019
                                                                               --------     --------     ------------
Net interest income..........................................................   231,391      130,288        361,679
Provision for loan losses....................................................     6,674        6,477         13,151
                                                                               --------     --------     ------------
Net interest income after provision for loan losses..........................   224,717      123,811        348,528
OTHER INCOME:
  Data processing services...................................................   100,457           98        100,555
  Trust services.............................................................    36,227        9,694         45,921
  Other customer services....................................................    59,817       26,498         86,315
  Net securities gains.......................................................     3,665          480          4,145
  Other......................................................................    18,337       12,074         30,411
                                                                               --------     --------     ------------
Total other income...........................................................   218,503       48,844        267,347
OTHER EXPENSE:
  Salaries and employee benefits.............................................   172,219       68,642        240,861
  Net occupancy..............................................................    18,129        9,824         27,953
  Equipment..................................................................    31,251       12,418         43,669
  Other......................................................................    75,470       31,432        106,902
                                                                               --------     --------     ------------
Total other expense..........................................................   297,069      122,316        419,385
                                                                               --------     --------     ------------
Income before income taxes...................................................   146,151       50,339        196,490
Provision for income taxes...................................................    52,229       16,380         68,609
                                                                               --------     --------     ------------
Net income...................................................................  $ 93,922     $ 33,959       $127,881
                                                                               --------     --------     ------------
                                                                               --------     --------     ------------
PER COMMON SHARE(1)(3):
  Primary....................................................................  $   1.39     $   1.68       $   1.24
  Fully diluted..............................................................      1.30         1.68           1.19
  Dividends Paid.............................................................      0.40         0.69           0.40
AVERAGE COMMON SHARES OUTSTANDING(1)(3):
  Primary....................................................................    67,712       20,246        102,917
  Fully diluted..............................................................    73,619       20,246        109,220
</TABLE>
 
         See Notes to Pro Forma Combined Condensed Financial Statements
 
                                       49
<PAGE>   55
 
                 PRO FORMA COMBINED CONDENSED INCOME STATEMENTS
 
                      NINE MONTHS ENDED SEPTEMBER 30, 1992
 
                     (In thousands, except per share data)
 
<TABLE>
<CAPTION>
                                                                                                          PRO FORMA
                                                                                 M&I         VALLEY      COMBINED (2)
                                                                               --------     --------     ------------
<S>                                                                            <C>          <C>          <C>
INTEREST INCOME:
  Loans......................................................................  $303,939     $195,798       $499,737
  Investment securities:
    Taxable..................................................................    72,929       32,041        104,970
    Exempt from Federal income taxes.........................................    16,494       11,217         27,711
  Short-term investments.....................................................     9,989        1,406         11,395
                                                                               --------     --------     ------------
Total interest income........................................................   403,351      240,462        643,813
INTEREST EXPENSE:
  Deposits...................................................................   148,751      109,055        257,806
  Short-term borrowings......................................................    11,199        3,437         14,636
  Long-term borrowings.......................................................    14,893        5,726         20,619
                                                                               --------     --------     ------------
Total interest expense.......................................................   174,843      118,218        293,061
                                                                               --------     --------     ------------
Net interest income..........................................................   228,508      122,244        350,752
Provision for loan losses....................................................    10,885        6,461         17,346
                                                                               --------     --------     ------------
Net interest income after provision for loan losses..........................   217,623      115,783        333,406
OTHER INCOME:
  Data processing services...................................................    83,360          142         83,502
  Trust services.............................................................    34,727        9,397         44,124
  Other customer services....................................................    56,847       24,204         81,051
  Net securities gains.......................................................     1,621          411          2,032
  Other......................................................................    15,258        9,240         24,498
                                                                               --------     --------     ------------
Total other income...........................................................   191,813       43,394        235,207
OTHER EXPENSE:
  Salaries and employee benefits (6).........................................   155,205       66,716        221,921
  Net occupancy..............................................................    17,874        8,726         26,600
  Equipment..................................................................    28,861       12,235         41,096
  Other......................................................................    79,100       30,243        109,343
                                                                               --------     --------     ------------
Total other expense..........................................................   281,040      117,920        398,960
                                                                               --------     --------     ------------
Income before income taxes and cumulative effect of changes in accounting
  principles.................................................................   128,396       41,257        169,653
Provision for income taxes...................................................    43,098       12,522         55,620
                                                                               --------     --------     ------------
Income before cumulative effect of changes in accounting principles..........  $ 85,298     $ 28,735       $114,033
                                                                               --------     --------     ------------
                                                                               --------     --------     ------------
PER COMMON SHARE(1)(3):
  Primary:
    Income before cumulative effect..........................................  $   1.27     $   1.51       $   1.13
  Fully diluted:
    Income before cumulative effect..........................................      1.19         1.51           1.09
  Dividends Paid.............................................................      0.36         0.64           0.36
AVERAGE COMMON SHARES OUTSTANDING(1)(3):
  Primary....................................................................    67,407       18,968        100,487
  Fully diluted..............................................................    73,602       18,968        106,847
</TABLE>
 
         See Notes to Pro Forma Combined Condensed Financial Statements
 
                                       50
<PAGE>   56
 
                 PRO FORMA COMBINED CONDENSED INCOME STATEMENTS
 
                          YEAR ENDED DECEMBER 31, 1992
 
                     (In thousands, except per share data)
 
<TABLE>
<CAPTION>
                                                                                                          PRO FORMA
                                                                                 M&I         VALLEY      COMBINED (2)
                                                                               --------     --------     ------------
<S>                                                                            <C>          <C>          <C>
INTEREST INCOME:
  Loans......................................................................  $400,414     $263,738       $664,152
  Investment securities:
    Taxable..................................................................    98,031       42,096        140,127
    Exempt from Federal income taxes.........................................    20,778       14,190         34,968
  Short-term investments.....................................................    12,849        1,604         14,453
                                                                               --------     --------     ------------
Total interest income........................................................   532,072      321,628        853,700
INTEREST EXPENSE:
  Deposits...................................................................   190,582      143,488        334,070
  Short-term borrowings......................................................    14,600        4,099         18,699
  Long-term borrowings.......................................................    19,085        7,501         26,586
                                                                               --------     --------     ------------
Total interest expense.......................................................   224,267      155,088        379,355
                                                                               --------     --------     ------------
Net interest income..........................................................   307,805      166,540        474,345
Provision for loan losses....................................................    15,151        8,395         23,546
                                                                               --------     --------     ------------
Net interest income after provision for loan losses..........................   292,654      158,145        450,799
OTHER INCOME:
  Data processing services...................................................   112,964          176        113,140
  Trust services.............................................................    45,595       12,455         58,050
  Other customer services....................................................    78,133       32,897        111,030
  Net securities gains.......................................................     8,343          864          9,207
  Other......................................................................    20,841       12,900         33,741
                                                                               --------     --------     ------------
Total other income...........................................................   265,876       59,292        325,168
OTHER EXPENSE:
  Salaries and employee benefits (6).........................................   215,932       90,178        306,110
  Net occupancy..............................................................    23,805       11,598         35,403
  Equipment..................................................................    38,691       16,134         54,825
  Other......................................................................   105,645       42,192        147,837
                                                                               --------     --------     ------------
Total other expense..........................................................   384,073      160,102        544,175
                                                                               --------     --------     ------------
Income before income taxes and cumulative effect of changes in accounting
  principles.................................................................   174,457       57,335        231,792
Provision for income taxes...................................................    57,835       17,556         75,391
                                                                               --------     --------     ------------
Income before cumulative effect of changes in accounting principles..........  $116,622     $ 39,779       $156,401
                                                                               --------     --------     ------------
                                                                               --------     --------     ------------
PER COMMON SHARE(1)(3):
  Primary:
    Income before cumulative effect..........................................  $   1.73     $   2.07       $   1.55
  Fully diluted:
    Income before cumulative effect..........................................      1.62         2.07           1.48
  Dividends Paid.............................................................      0.48         0.85           0.48
AVERAGE COMMON SHARES OUTSTANDING(1)(3):
  Primary....................................................................    67,523       19,244        101,163
  Fully diluted..............................................................    73,673       19,244        107,539
</TABLE>
 
         See Notes to Pro Forma Combined Condensed Financial Statements
 
                                       51
<PAGE>   57
 
                 PRO FORMA COMBINED CONDENSED INCOME STATEMENTS
 
                          YEAR ENDED DECEMBER 31, 1991
 
                     (In thousands, except per share data)
 
<TABLE>
<CAPTION>
                                                                                                          PRO FORMA
                                                                                 M&I         VALLEY      COMBINED (2)
                                                                               --------     --------     ------------
<S>                                                                            <C>          <C>          <C>
INTEREST INCOME:
  Loans......................................................................  $463,867     $263,527       $727,394
  Investment securities:
    Taxable..................................................................    97,348       44,198        141,545
    Exempt from Federal income taxes.........................................    27,587       18,991         46,578
  Short-term investments.....................................................    19,054        5,043         24,096
                                                                               --------     --------     ------------
Total interest income........................................................   607,856      331,759        939,613
INTEREST EXPENSE:
  Deposits...................................................................   271,454      176,957        448,411
  Short-term borrowings......................................................    27,288        5,434         32,722
  Long-term borrowings.......................................................    20,146        7,762         27,907
                                                                               --------     --------     ------------
Total interest expense.......................................................   318,888      190,153        509,040
                                                                               --------     --------     ------------
Net interest income..........................................................   288,968      141,606        430,573
Provision for loan losses....................................................    20,555        8,369         28,924
                                                                               --------     --------     ------------
Net interest income after provision for loan losses..........................   268,413      133,237        401,649
OTHER INCOME:
  Data processing services...................................................    92,580          509         93,089
  Trust services.............................................................    43,133       10,927         54,060
  Other customer services....................................................    66,064       27,744         93,808
  Net securities gains.......................................................     4,381          725          5,106
  Other......................................................................    21,422        8,113         29,535
                                                                               --------     --------     ------------
Total other income...........................................................   227,580       48,018        275,598
OTHER EXPENSE:
  Salaries and employee benefits.............................................   187,456       77,289        264,745
  Net occupancy..............................................................    23,543       10,773         34,316
  Equipment..................................................................    36,043       13,639         49,682
  Other......................................................................   102,469       39,298        141,766
                                                                               --------     --------     ------------
Total other expense..........................................................   349,511      140,999        490,509
                                                                               --------     --------     ------------
Income before income taxes...................................................   146,482       40,256        186,738
Provision for income taxes...................................................    47,135        9,590         56,725
                                                                               --------     --------     ------------
Net income...................................................................  $ 99,347     $ 30,666       $130,013
                                                                               --------     --------     ------------
                                                                               --------     --------     ------------
PER COMMON SHARE(1)(3):
  Primary....................................................................  $   1.50     $   1.67       $   1.33
  Fully diluted..............................................................      1.40         1.67           1.27
  Dividends Paid.............................................................      0.43         0.80           0.43
AVERAGE COMMON SHARES OUTSTANDING(1)(3):
  Primary....................................................................    66,162       18,336         97,993
  Fully diluted..............................................................    72,962       18,336        105,016
</TABLE>
 
         See Notes to Pro Forma Combined Condensed Financial Statements
 
                                       52
<PAGE>   58
 
                 PRO FORMA COMBINED CONDENSED INCOME STATEMENTS
 
                          YEAR ENDED DECEMBER 31, 1990
 
                     (In thousands, except per share data)
 
<TABLE>
<CAPTION>
                                                                                                          PRO FORMA
                                                                                 M&I         VALLEY      COMBINED (2)
                                                                               --------     --------     ------------
<S>                                                                            <C>          <C>          <C>
INTEREST INCOME:
  Loans......................................................................  $501,005     $239,990       $740,995
  Investment securities:
    Taxable..................................................................    99,466       40,773        140,239
    Exempt from Federal income taxes.........................................    28,907       16,977         45,884
  Short-term investments.....................................................    12,381        8,872         21,253
                                                                               --------     --------     ------------
Total interest income........................................................   641,759      306,612        948,371
INTEREST EXPENSE:
  Deposits...................................................................   297,063      169,474        466,537
  Short-term borrowings......................................................    50,763        6,086         56,849
  Long-term borrowings.......................................................    18,540        3,984         22,524
                                                                               --------     --------     ------------
Total interest expense.......................................................   366,366      179,544        545,910
                                                                               --------     --------     ------------
Net interest income..........................................................   275,393      127,068        402,461
Provision for loan losses....................................................    39,775        7,864         47,639
                                                                               --------     --------     ------------
Net interest income after provision for loan losses..........................   235,618      119,204        354,822
OTHER INCOME:
  Data processing services...................................................    75,047        1,188         76,235
  Trust services.............................................................    39,942        9,270         49,212
  Other customer services....................................................    57,645       23,304         80,949
  Net securities gains (losses)..............................................     1,698          (26)         1,672
  Other......................................................................    17,194        6,407         23,601
                                                                               --------     --------     ------------
Total other income...........................................................   191,526       40,143        231,669
OTHER EXPENSE:
  Salaries and employee benefits.............................................   172,690       65,304        237,994
  Net occupancy..............................................................    20,276        9,016         29,292
  Equipment..................................................................    33,937       10,773         44,710
  Restructuring..............................................................     --           1,603          1,603
  Other......................................................................    95,986       33,714        129,700
                                                                               --------     --------     ------------
Total other expense..........................................................   322,889      120,410        443,299
                                                                               --------     --------     ------------
Income before income taxes...................................................   104,255       38,937        143,192
Provision for income taxes...................................................    32,921        9,909         42,830
                                                                               --------     --------     ------------
Net income...................................................................  $ 71,334     $ 29,028       $100,362
                                                                               --------     --------     ------------
                                                                               --------     --------     ------------
PER COMMON SHARE(1)(3):
  Primary....................................................................  $   1.08     $   1.61       $   1.03
  Fully diluted..............................................................      1.03         1.61           1.00
  Dividends Paid.............................................................      0.39         0.75           0.39
AVERAGE COMMON SHARES OUTSTANDING(1)(3):
  Primary....................................................................    65,943       18,015         97,277
  Fully diluted..............................................................    72,204       18,015        103,538
</TABLE>
 
         See Notes to Pro Forma Combined Condensed Financial Statements
 
                                       53
<PAGE>   59
 
           NOTES TO PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS
 
1.   The pro forma combined condensed financial statements reflect the issuance
     of 1.72 common shares of M&I for each outstanding common share of Valley.
 
2.   Transactions between M&I and Valley are not material in relation to the pro
     forma combined condensed financial statements and, therefore, intercompany
     balances have not been eliminated for the pro forma combined amounts.
 
3.   As permitted by accounting standards, Valley's historical average shares
     outstanding used in the computation of earnings per share did not include
     the dilutive effect of stock options outstanding as such effect was not
     material. The computation of pro forma primary and fully diluted earnings
     per share include the effects of Valley's stock options outstanding.
 
4.   Pro forma shareholders' equity includes the effect of the estimated
     one-time restructuring charge of approximately $80 million, $48 million net
     of tax effect. Since the estimated charge is non-recurring, it has not been
     reflected in the pro forma combined condensed income statements and related
     per share calculations. The estimated restructuring charge consists of the
     following items:
 
<TABLE>
        <S>                                                                 <C>
        Employee severance and contract costs...........................    $48 million
        Write-off of duplicative data processing software...............     11 million
        Write-down of facilities and equipment to be sold...............     15 million
        Other...........................................................      6 million
                                                                            -----------
                                                                            $80 million
</TABLE>
 
     Potential loan loss provisions could be recorded at or near the
     consummation of the Merger. While the amounts have not been quantified, an
     additional provision may be necessary to conform Valley's loan valuation
     policies with those of M&I. M&I does not anticipate that the amount of such
     provision will be material to the combined entity.
 
5.   In May 1993, Valley announced the acquisition of the Pierce County Bank &
     Trust Co. with assets of approximately $112 million at September 30, 1993.
     The acquisition, to be accounted for as a purchase, is not material to
     Valley nor to the pro forma combined condensed financial statements, and
     therefore, has not been reflected in these statements. The acquisition was
     completed as of November 6, 1993.
 
6.   During 1992, M&I adopted Financial Accounting Standard No. 106 "Employers'
     Accounting for Postretirement Benefits, Other than Pensions" ("FAS 106").
     M&I elected immediate recognition of the accumulated postretirement
     obligation at January 1, 1992, through a one-time charge to earnings. M&I
     also adopted Financial Accounting Standard No. 109 "Accounting for Income
     Taxes." Statement 109 required a change from the deferred method of
     accounting for income taxes to an asset and liability method. During the
     first quarter of 1993, Valley adopted FAS 106 on a prospective basis and
     elected to amortize the unfunded accumulated post retirement benefit
     obligation over twenty years. The effect of conforming the accounting
     policies on income before cumulative effect of changes in accounting
     principles (operating income) is not material to the Pro Forma Combined
     Condensed Income Statements.
 
                                       54
<PAGE>   60
 
                   AMENDMENT TO M&I ARTICLES OF INCORPORATION
 
     The following discussion is qualified in its entirety by reference to the
text of the M&I Articles Amendment which is attached hereto as Appendix C.
 
     The M&I Board of Directors unanimously recommends a vote FOR approval of
the M&I Articles Amendment.
 
     At the M&I Special Meeting, M&I shareholders will be requested to approve
the M&I Articles Amendment. The M&I Articles Amendment consists of (i) a
proposed amendment to Article III of the M&I Articles to increase the number of
authorized shares of M&I Common Stock from 80,000,000 shares to 160,000,000
shares, (ii) a proposed amendment to Article VI of the M&I Articles to remove
the limitation that the number of directors shall be not less than 8 nor more
than 15 directors, and to replace such provision with a requirement that the
number of directors shall not be less than 3 directors, and (iii) a proposed
amendment to Article VI of the M&I Articles to remove the limitation that not
more than two newly created directorships may be filled by the directors in any
period between annual meetings of shareholders. Approval of the proposed
amendments to the M&I Articles is a necessary condition for M&I to consummate
the Merger. Approval of the Merger and the 1993 Stock Option Plan are not
conditions for approval of the M&I Articles Amendment. The text of the M&I
Articles Amendment is attached hereto as Appendix C.
 
     As of the M&I Record Date, of the 80,000,000 shares of M&I Common Stock
presently authorized, 60,828,773 shares were issued and outstanding, 5,579,986
shares were held as treasury stock, 7,935,783 shares were reserved for issuance
pursuant to employee stock options (including the 1993 Stock Option Plan), and
7,677,186 shares were reserved for issuance pursuant to convertible preferred
stock and convertible debt securities. M&I may utilize treasury stock in lieu of
newly issued M&I Common Stock for certain of the purposes for which M&I Common
Stock is currently reserved. If the Merger is completed, a total of up to
37,188,021 shares of M&I Common Stock would be issued to the former holders of
Valley Common Stock and the holders of options to purchase Valley Common Stock
upon exercise of such options. In addition, M&I is obligated to grant options to
purchase 220,000 shares of M&I Common Stock to certain officers of Valley who
will become officers of M&I. See "THE MERGER -- Interests of Certain Persons in
the Merger." Since there are currently insufficient authorized shares to
complete the Merger and related transactions, approval of the M&I Articles
Amendment is a condition to the consummation of the Merger.
 
     The additional authorized shares of M&I Common Stock may be used for any
proper corporate purpose approved by the M&I Board of Directors. Their
availability would enable the M&I Board of Directors and management, to the
extent authorized by the Board of Directors, to act with flexibility when
favorable opportunities arise to expand or strengthen M&I's business through the
issuance of M&I Common Stock. Among the reasons for issuing additional shares
would be to increase M&I's capital through sales of M&I Common Stock, to engage
in other types of capital transactions, to undertake acquisitions, and to
satisfy existing contractual commitments, including employee stock options and
convertible securities. The M&I Board of Directors has not proposed the
increases in authorized capital stock with the intention of discouraging tender
offers or takeover attempts. However, the availability of authorized shares for
issuance could render more difficult or discourage a merger, tender offer, proxy
contest or other attempt to obtain control of M&I.
 
     M&I management regularly reviews a range of financing transactions
including the issuance of M&I Common Stock. Except for shares to be issued in
connection with the Merger and shares reserved for issuance as described above,
M&I has no present intention of issuing or selling M&I Common Stock for any
purpose, but may do so if market and other conditions should indicate that such
a course of action were advisable.
 
     If the M&I Articles Amendment is adopted, the M&I Board of Directors
generally may issue the additional authorized shares of M&I Common Stock without
further shareholder approval. In some instances, shareholder approval for the
issuance of additional shares may be required by law or by the requirements of
the NASDAQ/NMS, on which the M&I Common Stock is listed, or the obtaining of
such approval otherwise may be necessary or desirable. Except in such cases, it
is not anticipated that further shareholder
                                       55
<PAGE>   61
authorization will be solicited. Holders of M&I Common Stock are not entitled to
preemptive rights to purchase any new issue of M&I Common Stock or securities
convertible into M&I Common Stock.
 
     M&I has agreed in the Merger Agreement that at the Effective Time it will
appoint four current Valley directors to the M&I Board of Directors. See "THE
MERGER -- Management and Operations After the Merger." Article VI of the M&I
Articles currently provides that the number of directors shall not be less than
8 nor more than 15 directors, with the exact number of directors to be
determined from time to time by Board resolution. M&I currently has 12
directors, and, therefore, in order to appoint four more directors, Article VI
would need to be amended. The proposed amendment would replace the existing
provision with a requirement that the number of directors shall not be less than
3 directors, with the exact number of directors to be determined from time to
time by Board resolution. The effect of this amendment would be to allow the M&I
Board of Directors to increase the number of directors without limitation, or
decrease the number of directors to not less than 3; provided, however, that in
no case may a decrease in the number of directors shorten the term of any
incumbent director. The WBCL requires at least 1 natural person to act as a
director. However, since M&I's Board of Directors has three classes, 3 is the
minimum number of directors that will allow for one director in each class. M&I
has no current intention to add any directors except as set forth above.
However, M&I may in the future increase or decrease the size of its Board as
permitted by the WBCL and the M&I Articles. Article VI of the M&I Articles also
limits to two the number of newly created directorships which may be filled by
the directors in any period between annual meetings. As discussed above, in the
Merger Agreement M&I has agreed to appoint four current Valley directors to the
M&I Board of Directors at the Effective Time. The proposed amendment would
delete the limitation on filling newly created directorships entirely, thus
allowing the M&I Board of Directors to create and fill an unlimited number of
newly created directorships. Again, M&I has no current intention to create any
new directorships except as set forth above.
 
                        DESCRIPTION OF M&I CAPITAL STOCK
 
IN GENERAL
 
     The authorized capital stock of M&I currently consists of 80,000,000 shares
of M&I Common Stock, $1.00 par value, and 5,000,000 shares of Preferred Stock,
$1.00 par value (the "M&I Preferred Stock"), of which 500,000 shares have been
designated by the M&I Board of Directors as Series A Convertible Preferred
Stock, $1.00 par value (the "M&I Series A Preferred Stock"). As of the M&I
Record Date, 60,828,773 shares of M&I Common Stock were outstanding and 185,314
shares of M&I Series A Preferred Stock were outstanding. Pursuant to this Joint
Proxy Statement-Prospectus, shareholders of M&I will be asked to approve the
Articles Amendment, which would, among other changes, increase the authorized
M&I Common Stock from 80,000,000 shares to 160,000,000 shares. See "AMENDMENT TO
M&I ARTICLES OF INCORPORATION." The M&I Common Stock is quoted on the
NASDAQ/NMS. The M&I Series A Preferred Stock is not publicly traded.
 
M&I COMMON STOCK
 
     The following description of M&I Common Stock, which is to be issued to
Valley shareholders in connection with the Merger, does not purport to be a
complete description of the applicable provisions of the M&I Articles and
By-Laws, as amended, or of applicable statutory or other law, and is qualified,
in its entirety by reference thereto. See "INCORPORATION OF CERTAIN DOCUMENTS BY
REFERENCE."
 
     Voting. Each holder of M&I Common Stock is entitled at each shareholders'
meeting of M&I, as to each matter to be voted upon, to cast one vote, in person
or by proxy, for each share of M&I Common Stock registered in his or her name on
the stock transfer books of M&I, except to the extent that the voting power of
shares held by any person in excess of 20% of the voting power in the election
of directors may be limited (in voting on any matter) to one-tenth of the full
voting power of those shares under Section 180.1150 of the WBCL. Such voting
rights are not cumulative.
 
     Dividends. The holders of M&I Common Stock are entitled to receive
dividends, when, as and if declared by the Board of Directors of M&I out of any
funds legally available therefor after dividends have been paid to the holders
of the M&I Preferred Stock.
 
                                       56
<PAGE>   62
 
     Liquidation. Upon liquidation of M&I, the holders of M&I Common Stock are
entitled to receive the net assets of M&I after satisfaction in full of the
prior rights of creditors of M&I and holders of the M&I Preferred Stock.
 
     Miscellaneous. M&I Common Stock is not convertible into shares of any other
class of capital stock. Holders of M&I Common Stock are not and will not be
entitled to any preemptive rights. The issued and outstanding shares of M&I
Common Stock are fully paid and non-assessable (except as otherwise provided
under Section 180.0622(2)(b) the WBCL).
 
M&I PREFERRED STOCK
 
     The M&I Preferred Stock is issuable in one or more series and, with respect
to any series, the M&I Board of Directors, subject to certain limitations, is
authorized to: (a) fix the number of shares; (b) designate any series and the
number of shares which shall constitute the series; (c) determine voting rights;
(d) determine dividend rates, payment dates and whether dividends shall be
cumulative; (e) determine the amount per share payable on the shares of each
series in the event of the liquidation or dissolution or winding up of M&I; (f)
determine any redemption provisions; (g) determine any sinking fund provisions;
(h) determine any conversion provisions; and (i) determine any other terms,
limitations and relative rights and preferences of the series as may lawfully be
determined by the Board of Directors and as shall not be inconsistent with the
M&I Articles and the WBCL.
 
     Shares of M&I Preferred Stock that are redeemed, repurchased or otherwise
acquired by M&I shall be returned and restored to the status of authorized,
unissued shares, but may be reissued only as a part of the M&I Preferred Stock
other than the series of which they were originally a part.
 
M&I SERIES A PREFERRED STOCK
 
     Voting. The holders of M&I Series A Preferred Stock only have voting rights
as provided by the WBCL, which generally occurs only if a proposed amendment to
the M&I Articles or a merger or share exchange would affect the M&I Series A
Preferred Stock.
 
     The WBCL provides that whenever, an amendment shall affect the holders of
shares of one or more but not all the series of any preferred or special class,
at the time outstanding, the holders of the outstanding shares of the series
affected shall be deemed a separate class and entitled to vote as a class on
such amendment.
 
     Dividends. The holders of M&I Series A Preferred Stock are entitled to
receive cash dividends when and as cash dividends are declared and become
payable with respect to the M&I Common Stock equal to the amount of the cash
dividend that such holder would have received had such holder converted M&I
Series A Preferred Stock into M&I Common Stock. Dividends on M&I Series A
Preferred Stock are noncumulative. Holders of M&I Series A Preferred Stock are
not entitled to any other earnings of M&I, except for the preference, if any, as
may be payable in case of liquidation, dissolution or winding up.
 
     Liquidation. In the event of any liquidation, dissolution, or winding up of
M&I, the holders of the Series A Preferred Stock shall be entitled to receive
$100 per share plus an amount equal to all dividends, if any, which have accrued
thereon as the result of the declaration of dividends on the M&I Common Stock
but which remain unpaid to the date of distribution. If, upon any liquidation,
dissolution or winding up of M&I, the assets of M&I to be paid or distributed to
the holders of the shares of the M&I Preferred Stock shall be insufficient to
pay in full the M&I Series A Preferred Stock liquidation preference and the
liquidation preference of any other equally ranking series of M&I Preferred
Stock, then such assets shall be shared ratably by the holders of M&I Series A
Preferred Stock and such other series of M&I Preferred Stock.
 
     Conversions. The holders of M&I Series A Preferred Stock have the right to
convert such shares into shares of M&I Common Stock at any time. Each share of
M&I Series A Preferred Stock shall be valued at $100 for the purposes of such
conversion. The price at which shares of M&I Common Stock shall be delivered
upon conversion is $8.75 per share of Common Stock. In certain instances the
conversion price will be adjusted.
 
                                       57
<PAGE>   63
 
CERTAIN PROVISIONS OF THE WISCONSIN BUSINESS CORPORATION LAW
 
     The WBCL provides that shareholders of Wisconsin domestic corporations are
personally liable, up to the par value of their shares ($1.00 per share in the
case of the M&I Common Stock), for all debts owed by the corporation to
employees for services performed but not exceeding six months' service in any
one case. While the WBCL specifies that such liability is limited to the par
value of the shares, par value has been interpreted by a Wisconsin court to mean
the consideration paid to the corporation for its shares.
 
     The WBCL prohibits a "business combination" (defined to include a merger,
share exchange or a disposition of 5% or more of the aggregate market value of
all assets or stock of the corporation) between a "resident domestic
corporation" and an "interested stockholder" (defined as the beneficial owner of
at least 10% of the voting power of the outstanding stock) for three years
following the stock acquisition date (i.e., the date the person became an
interested stockholder), unless the board of directors approves the business
combination or the purchase of stock by the interested stockholder before the
stock acquisition date. Business combinations after the three-year period
following the stock acquisition date are permitted only if (i) the board of
directors approved the acquisition of the stock prior to the stock acquisition
date; (ii) the business combination is approved by a majority of the outstanding
voting stock not beneficially owned by the interested stockholder; or (iii) the
consideration to be received by shareholders meets certain requirements of the
statute with respect to form and amount. M&I is a "resident domestic
corporation" within the meaning of the WBCL.
 
     Under the WBCL, the voting power of shares, including shares issuable upon
conversion of convertible securities or exercise of options or warrants, of an
"issuing public corporation" held by any person or persons acting as a group in
excess of 20% of the voting power in the election of directors is limited (in
voting on any matter) to 10% of the full voting power of those excess shares. An
issuing public corporation is defined as a domestic corporation, with (i) total
assets exceeding $1,000,000; (ii) a class of equity securities held of record by
500 or more persons; and (iii) at least 100 shareholders of record who have
unlimited voting rights and who reside in Wisconsin. M&I is an "issuing public
corporation" within the meaning of the WBCL. This restriction does not apply to
shares acquired (a) under an agreement entered into before the corporation was
an "issuing public corporation," (b) directly from the issuing public
corporation, (c) in a merger or share exchange to which the issuing public
corporation is a party, (d) in certain specified non-market transactions (i.e.,
gifts, distributions upon death and pledges) or (e) in a transaction incident to
which the corporation's shareholders have approved restoration of the full
voting power of the otherwise restricted shares.
 
     The WBCL provides that, in addition to the vote otherwise required by law
or the articles of incorporation of an "issuing public corporation" (defined
above), the approval by a majority vote of the holders of the corporation's
shares entitled to vote is required before such corporation can take certain
actions while a "takeover offer" (as defined in the WBCL) is being made or after
a takeover offer has been publicly announced and before it is concluded. Under
the WBCL, such shareholder approval is required for the corporation to (i)
acquire more than 5% of the corporation's outstanding voting shares at a price
above the market price from any individual or organization that owns more than
3% of the outstanding voting shares and has held such shares for less than two
years, unless a similar offer is made to acquire all voting shares or (ii) sell
or option assets of the corporation which amount to at least 10% of the market
value of the corporation, unless the corporation has at least three independent
directors and a majority of the independent directors vote not to have this
provision apply to the corporation.
 
     The WBCL also provides for certain super-majority voting and fair price
provisions in connection with certain business combinations substantially
similar to provisions contained in M&I's Articles. See "COMPARISON OF
SHAREHOLDER RIGHTS -- Certain Business Combinations."
 
     Under the WBCL, in discharging his or her duties to the corporation and in
determining what he or she believes to be in the best interests of the
corporation, a director or officer may, in addition to considering the effects
of any action on the corporation's shareholders, consider the effects of the
action on employees, suppliers, customers, the communities in which the
corporation operates and any other factors that the director or officer
considers pertinent.
 
                                       58
<PAGE>   64
 
                        COMPARISON OF SHAREHOLDER RIGHTS
 
     The following is a summary of the material differences between the rights
of holders of M&I Common Stock and the rights of holders of Valley Common Stock
prior to the Merger. As both M&I and Valley are organized under the laws of
Wisconsin, rights of shareholders are substantially similar. Differences in the
rights provided to shareholders of Valley and M&I arise from the provisions of
the articles of incorporation, by-laws and certain contractual commitments of
the entities. Certain provisions of the M&I Articles and By-Laws, which do not
have counterparts in the Valley Articles or By-Laws, could render more difficult
or discourage a merger, tender offer, proxy contest or other attempt to obtain
control of M&I. See "-- Anti-Takeover Effect of Certain Provisions." This
summary does not purport to be a complete discussion of and is qualified in its
entirety by reference to the governing law and the articles of incorporation,
by-laws and contractual commitments of each corporation.
 
AUTHORIZED CAPITAL STOCK
 
     M&I. The M&I Articles authorize the issuance of up to 85,000,000 shares of
capital stock, consisting of 80,000,000 shares of M&I Common Stock, par value
$1.00 per share, of which 60,828,773 shares were issued and outstanding as of
the M&I Record Date, and up to 5,000,000 shares of M&I Preferred Stock. If the
M&I Articles Amendment is approved at the M&I Special Meeting, the number of
authorized shares of M&I Common Stock will increase from 80,000,000 to
160,000,000. M&I Preferred Stock is issuable in series, each having such rights
and preferences as the M&I Board may, by adoption of an amendment of the M&I
Articles, fix and determine. As of the M&I Record Date, 185,314 shares of M&I
Series A Preferred were issued and outstanding. The M&I Board of Directors has
not proposed the increases in authorized capital stock with the intention of
discouraging tender offers or takeover attempts. However, the availability of
authorized shares for issuance could render more difficult or discourage a
merger, tender offer, proxy contest or other attempt to obtain control of M&I.
See "DESCRIPTION OF M&I CAPITAL STOCK" and "AMENDMENT TO M&I ARTICLES OF
INCORPORATION."
 
     Valley. The Valley Amended and Restated Articles of Incorporation, as
amended (the "Valley Articles") authorize the issuance of up to 41,000,000
shares of capital stock, consisting of 40,000,000 shares of Valley Common Stock,
par value $.50 per share, of which 20,721,290 shares were issued and outstanding
as of the Valley Record Date, and up to 1,000,000 shares of Preferred Stock, par
value $1.00 per share (the "Valley Preferred Stock"), no shares of which were
outstanding as of the Valley Record Date. Valley Preferred Stock is issuable in
series, each having such rights and preferences as the Valley Board may, by
adoption of an amendment of the Valley Articles, fix and determine. In
connection with the Valley Rights Agreement, discussed below, the Valley Board
has designated 200,000 shares of Valley Preferred Stock as Series A Preferred
Stock (the "Valley Series A Preferred"), and has reserved such shares for
issuance upon exercise of the Rights distributed pursuant to the Valley Rights
Agreement. See "-- Shareholder Rights Plan."
 
REQUIRED VOTE
 
     M&I. Pursuant to sec.180.1706(1) of the WBCL, except as otherwise provided
in a corporation's articles of incorporation or by-laws, any amendment to the
articles of incorporation, merger or certain other extraordinary events
involving a corporation organized before January 1, 1973, which did not
expressly elect before January 1, 1991 to be governed by a majority or greater
voting requirement, must be approved by the affirmative vote of two-thirds of
the shares entitled to vote at a meeting called for that purpose. The M&I
Articles were amended prior to January 1, 1991 to reduce the vote required for a
merger, consolidation or certain other extraordinary events to a majority vote
of the M&I capital stock entitled to vote, provided that three-quarters of the
M&I Board of Directors shall have approved the transaction. The M&I Articles
were not amended prior to January 1, 1991 to reduce the vote required to amend
the M&I Articles. Consequently, any amendment to the M&I Articles, including the
M&I Articles Amendment, requires the affirmative vote of two-thirds of the
outstanding shares of M&I capital stock entitled to vote at a meeting called for
that purpose. The requirement that two-thirds of the outstanding shares of M&I
capital stock entitled to vote at a meeting approve any amendment to the M&I
Articles could make it more difficult for any party seeking to take control of
M&I through a merger, tender offer, proxy contest, or otherwise to amend the M&I
Articles in futherance
 
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<PAGE>   65
 
of any such action, such as the repeal of provisions classifying the M&I Board
of Directors or permitting the removal of directors other than for "cause."
 
     Valley. Valley was organized before January 1, 1973 and expressly elected
before January 1, 1991 to be governed by a majority voting requirement for any
amendment to the articles of incorporation, merger or certain other
extraordinary events involving Valley. Thus, except as may otherwise be provided
by the WBCL, the affirmative vote of a majority of the outstanding shares of
Valley capital stock entitled to vote is required to adopt amendments to the
Valley Articles or to approve mergers and certain other extraordinary
transactions.
 
SIZE AND CLASSIFICATION OF BOARD OF DIRECTORS
 
     M&I. The M&I Articles and By-Laws provide that the M&I Board of Directors
will consist of not less than eight nor more than 15 directors (exclusive of
directors, if any, elected by the holders of one or more classes or series of
M&I Preferred Stock pursuant to the M&I Articles applicable thereto), the number
of which may be established within such limits by resolution adopted by the
affirmative vote of a majority of the entire Board of Directors then in office.
If the M&I Articles Amendment is approved, the Board of Directors shall consist
of not less than three directors, with the exact number of directors to be
determined from time to time by Board resolution. M&I's Board of Directors is
classified into three classes, with directors serving staggered three-year
terms. The classification of the M&I Board of Directors could render more
difficult or discourage attempts to obtain control of M&I through the election
of directors to the M&I Board of Directors. A party seeking to obtain control of
M&I through the election of directors could not elect a majority of the
directors of the M&I Board of Directors at a single meeting held for the purpose
of electing directors. A minimum of two meetings held for the purpose of
electing directors would be necessary for any such party to elect a majority of
the M&I Board of Directors.
 
     Valley. The Valley By-Laws provide that the Valley Board shall consist of
not less than five nor more than 25 members as determined by the shareholders at
each annual meeting. Between annual meetings, the Valley Board of Directors may
increase or decrease the number of directors; however, the Board of Directors
may not decrease the number if the term of any incumbent director would thereby
be affected. The Valley Articles and By-Laws do not provide for the
classification of Valley's Board of Directors.
 
REMOVAL OF DIRECTORS FOR "CAUSE"
 
     M&I. Exclusive of directors, if any, elected by holders of one or more
classes of M&I Preferred Stock, shareholders of M&I may remove a director only
for "cause" and then only by a vote of two-thirds of the outstanding shares of
capital stock of M&I entitled to vote at a meeting of shareholders called for
that purpose. "Cause" is defined solely as malfeasance arising from the
performance of a director's duties which has a materially adverse effect on the
business of M&I. This provision could deter or discourage a party seeking to
obtain control of M&I by removing one or more directors from the M&I Board of
Directors.
 
     Valley. The Valley Articles and By-Laws provide that a director may be
removed from office by the affirmative vote of a majority of shares outstanding
and entitled to vote for the election of such director, with or without "cause."
 
NEWLY CREATED DIRECTORSHIPS AND VACANCIES ON THE BOARD OF DIRECTORS
 
     M&I. Pursuant to sec.180.0810 of the WBCL, unless otherwise provided in a
corporation's articles of incorporation, shareholders may fill vacancies on a
corporation's board of directors. The M&I Articles and By-Laws provide that
newly created directorships and any vacancies on M&I's Board of Directors shall
be filled by the Board of Directors; provided, however, that if the number of
directors is increased, not more than two such newly created directorships may
be filled by the directors in any period between annual meetings of
shareholders. If the M&I Articles Amendment is approved, there will be no
limitation on the number of newly created directorships that may be filled by
the directors between annual meetings of shareholders. See "AMENDMENT TO M&I
ARTICLES OF INCORPORATION." Since shareholders of M&I may not fill vacancies in
the M&I Board of Directors, a party seeking to obtain control of the M&I Board
of Directors could not fill such vacancies by a shareholder vote.
 
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<PAGE>   66
 
     Valley. Valley's By-Laws authorize the Board of Directors, by the
affirmative vote of a majority of the directors then in office, though less than
a quorum, to fill vacancies on Valley's Board of Directors until the next
succeeding election of directors. In addition, pursuant to sec.180.0810 of the
WBCL, unless otherwise provided in a corporation's articles of incorporation,
shareholders may fill vacancies on a corporation's board of directors.
 
ADVANCE NOTICE OF PROPOSALS TO BE BROUGHT AT THE ANNUAL MEETING
 
     M&I. Pursuant to Section 2.5 of the M&I By-Laws, any shareholder who
intends to bring business before an annual meeting of shareholders (other than
nominations for directors) must provide M&I with notice of such intention, the
nature of such proposal, the reasons for conducting such business at the annual
meeting and certain information regarding the shareholder bringing the proposal
not less than 60 days prior to the meeting. This provision could render more
difficult or discourage an attempt to obtain control of M&I through a proposal
brought before an annual meeting of shareholders. M&I would have to be given
advance notice of any such proposal in accordance with the M&I By-Laws which
notice to M&I may discourage the making of such proposal.
 
     Valley. The Valley Articles and By-Laws do not contain any provisions
relating to advance notice of proposals to be brought before an annual meeting.
 
ADVANCE NOTICE OF NOMINATIONS OF DIRECTORS
 
     M&I. Pursuant to Article VI of the M&I Articles and Section 2.6 of the M&I
By-Laws, any shareholder who intends to nominate directors for election at a
meeting called for that purpose must provide M&I with notice of such intention,
a written consent of the nominee to serve as a director, certain information
regarding the proposed nominee and certain information regarding the nominating
shareholder not less than 30 days prior to the meeting. This provision could
deter or discourage a party seeking to obtain control of M&I by electing
directors to the M&I Board of Directors. Any such party would be required to
comply with the M&I Articles and M&I By-Laws in nominating directors to the M&I
Board of Directors and such compliance could deter or discourage such party from
nominating directors to the M&I Board of Directors.
 
     Valley. The Valley Articles and By-Laws do not contain any provisions
relating to advance notice of nominations of directors.
 
CERTAIN BUSINESS COMBINATIONS
 
        M&I. Article XII of M&I's Articles provides that an affirmative vote of
80% of M&I's outstanding capital stock entitled to vote in the election of
directors, or two-thirds of the shares entitled to so vote excluding shares of
M&I capital stock held by an "interested stockholder" (as hereinafter defined),
is required to approve a merger or other business combination involving M&I, or
any subsidiary, and any interested stockholder or an affiliate or associate of
an interested stockholder (excluding M&I or any subsidiary thereof or employee
benefit plan for the benefit of employees of M&I or its subsidiaries). An
interested stockholder refers to (a) the beneficial owner of more than 10% of
M&I's outstanding capital stock entitled to vote in the election of directors,
(b) an affiliate or associate of M&I that at any time within the two year
period preceding the combination was a beneficial owner of 10% or more of the
outstanding M&I capital stock entitled to vote in the election of directors or
(c) an assignee of or successor to any M&I capital stock entitled to vote in
the election of directors previously beneficially owned within the two year
period preceding the combination by another interested stockholder, if such
assignment or succession occurred involved a transaction not involving a public
offering within the meaning of the Securities Act. These provisions of the M&I
Articles do not apply if (a) the consideration offered in connection with such
transaction satisfies certain "fair price" requirements or (b) a majority of
the "disinterested directors" (defined as a director who is not affiliated with
the interested stockholder and who either was (i) a member of the Board of
Directors prior to the date that the interested stockholder became such or (ii)
elected or recommended for election by a majority of the disinterested
directors in office at the time such director was nominated for election)
approves the transaction. The supermajority voting provisions could deter or
discourage an "interested stockholder" from proposing or pursuing a business
combination with M&I.
 
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<PAGE>   67
 
     Valley. Valley's Articles of Incorporation and By-Laws do not contain any
supermajority voting provisions relating to the approval by holders of Valley
capital stock of mergers or other business combinations, although Valley, as a
Wisconsin corporation, is subject to substantially similar provisions contained
in the WBCL. See "DESCRIPTION OF M&I CAPITAL STOCK -- Certain Provisions of the
Wisconsin Business Corporation Law."
 
SHAREHOLDER RIGHTS PLAN
 
     M&I. M&I does not have a shareholder rights plan.
 
     Valley. On October 21, 1988, Valley's Board of Directors declared a
dividend distribution of one preferred share purchase right (a "Valley Right")
for each outstanding share of Valley Common Stock. Due to the 3-for-2 stock
split of Valley Common Stock on August 27, 1993, each outstanding share of
Valley Common Stock now evidences two-thirds of a Right. Detailed provisions of
the Rights are set forth in the Valley Rights Agreement and the following
paragraph summarizes, in general terms, only certain of the more significant
provisions.
 
     The Valley Rights do not become exercisable until after a person or group
acquires or has the right to acquire beneficial ownership of 20% or more of the
outstanding Valley Common Stock, or after commencement of a tender or exchange
offer, the consummation of which would result in a person or group becoming the
beneficial owner of 30% or more of the outstanding Valley Common Stock. If the
Valley Rights become exercisable, initially each holder of a Valley Right will
be entitled to purchase from Valley one one-hundredth (1/100) of a share of
Valley Series A Preferred at a price of $60 per share, subject to adjustment. If
after the Valley Rights become exercisable: (a) Valley is involved in any of
certain types of transactions with an Acquiring Person or any person becomes the
beneficial owner of more than 25% of the outstanding Valley Common Stock, one
Valley Right will permit each holder other than an Acquiring Person to receive,
upon exercise, Valley Common Stock, or, in certain circumstances, cash, property
or other securities of Valley, having a value equal to two times the exercise
price of the Valley Right, or (b) Valley or 50% or more of its assets or earning
power is acquired in any of certain types of transactions, provisions shall be
made so that each holder other than an Acquiring Person will receive, upon
exercising one Valley Right, common shares of the acquiring company having a
value equal to two times the exercise price of the Valley Right. In certain
events Valley may exchange shares of Valley Common Stock or Valley Series A
Preferred for outstanding and exercisable Valley Rights, other than those held
by an Acquiring Person, at the ratio of one share of Valley Common Stock, or one
one-hundredth (1/100) of a share of Valley Series A Preferred, for each Valley
Right. The Valley Rights, which expire on October 21, 1998, are nonvoting and
may be redeemed by Valley at $.05 per Valley Right at any time prior to the
occurrence of certain events. The Valley Rights Agreement may be amended by the
Valley Board of Directors with the concurrence of a majority of the Board's
independent directors.
 
     Pursuant to the Valley Rights Agreement Amendment, dated as of September
19, 1993, (a) neither M&I nor any affiliate of M&I shall be deemed an Acquiring
Person, and (b) the execution, delivery and performance of the Merger Agreement
and the Option Agreement does not and will not result in a Shares Acquisition
Date or Distribution Date, provided that M&I and its affiliates acquire Valley
Common Stock only in the manner specified in the Valley Rights Agreement
Amendment. Furthermore, at the Effective Time, all shares of M&I Common Stock
issued upon conversion of Valley Common Stock shall be deemed to have been
issued in full satisfaction of all rights pertaining to such shares of Valley
Common Stock, including each Valley Right.
 
ANTI-TAKEOVER EFFECT OF CERTAIN PROVISIONS
 
     Certain provisions of the M&I Articles and By-Laws could render more
difficult or discourage a merger, tender offer, proxy contest or other attempt
to obtain control of M&I. The M&I Articles may only be amended by the
affirmative vote of two-thirds of the outstanding shares of M&I capital stock
entitled to vote at a meeting called for that purpose. In addition, any merger,
consolidation or certain other extraordinary events, unless approved by
three-quarters of the Board of Directors of M&I, requires approval by the
                                       62
<PAGE>   68
affirmative vote of two-thirds of the outstanding shares of the M&I capital
stock entitled to vote at a meeting called for that purpose. This two-thirds
requirement may be increased for mergers or other business combinations with an
"interested stockholder" to 80% of the outstanding capital stock entitled to
vote in the election of directors or two-thirds of the shares entitled to so
vote excluding any shares held by an interested stockholder. In addition, the
M&I Articles require advance notice by shareholders to M&I of any business to be
brought before M&I's annual meeting. See "-- Required Vote," "-- Certain
Business Combinations," and "-- Advance Notice of Proposals to be Brought at the
Annual Meeting." Under the Valley Articles, the vote required to amend the
Valley Articles, and for any merger, consolidation or certain other
extraordinary transactions, is a majority of the outstanding shares of Valley
capital stock entitled to vote at a meeting called for that purpose. In
addition, the Valley Articles have no comparable supermajority voting provisions
(although the M&I supermajority provisions substantially parallel existing
provisions in the WBCL to which Valley is subject, see "-- Certain Business
Combinations" and "DESCRIPTION OF M&I CAPITAL STOCK -- Certain Provisions of the
Wisconsin Business Corporation Law.") or advance notice provisions for annual
shareholders meetings. See "-- Advance Notice of Proposals to be Brought at the
Annual Meeting." Since the M&I Articles require a greater vote than the Valley
Articles for articles amendments and mergers, consolidations and certain other
extraordinary transactions, absent approval by three-quarters of the M&I Board
of Directors, and advance notice of shareholders proposals, this could render
more difficult or discourage a merger, tender offer, proxy contest or other
attempt to obtain control of M&I, since any party proposing such transaction
would need to obtain approval by two-thirds of the M&I shareholders entitled to
vote and meet notice provisions to propose any business to be transacted at the
annual meeting of shareholders. These provisions of M&I's Articles may,
therefore, preclude M&I shareholders from considering, or proposing, certain
transactions at a higher price than the then-prevailing market price of M&I
Common Stock, absent approval by the Board of Directors of M&I.
 
     In addition, the M&I Articles permit removal of directors only for "Cause,"
provide for a staggered Board of Directors with three classes of directors each
with three year terms, presently only permit vacancies on the Board of Directors
to be filled by the Board of Directors and provide only two newly created
directorships may be filled between annual meetings, and require advance notice
to M&I of any shareholder nomination for directors prior to any shareholder
meeting. See "-- Size and Classification of Board of Directors," "-- Removal of
Directors for 'Cause,"' "-- Newly Created Directorships and Vacancies on the
Board of Directors," and "-- Advance Notice of Nominations of Directors." The
M&I Articles restriction on filling vacancies is proposed to be amended at the
M&I Special Meeting. See "AMENDMENT TO M&I ARTICLES OF INCORPORATION." The
Valley Articles do not contain similar provisions and, therefore, directors may
be removed by shareholders with or without cause, are elected at each annual
meeting and may be appointed to fill vacancies by shareholders or the Valley
Board of Directors without regard to the number of vacancies. See "-- Size and
Classification of Board of Directors," "-- Removal of Directors for Cause,"
"-- Newly Created Directorships and Vacancies on the Board of Directors" and "--
Advance Notice of Nominations of Directors." Accordingly, the M&I Articles may
preclude shareholders, regardless of their shareholdings, from gaining control
of M&I's Board of Directors, except over an extended time period, whereas the
Valley Articles would not preclude such action on the part of a significant
shareholder. These provisions in the M&I Articles may, therefore, render it more
difficult or discourage a merger, tender offer, proxy contest or other attempt
to obtain control of M&I.
 
     Valley currently has issued the Valley Rights, while M&I has not issued
similar securities. See
"-- Shareholder Rights Plan." Accordingly, shareholders of M&I will not have the
benefits of such Rights, including the right to purchase Valley securities, or
securities of an acquiring entity, on favorable price terms.
 
     For a description of certain anti-takeover provisions generally applicable
to all Wisconsin publicly held corporations, see "DESCRIPTION OF M&I CAPITAL
STOCK -- Certain Provisions of the Wisconsin Business Corporation Law."
 
                                       63
<PAGE>   69
 
                        1993 EXECUTIVE STOCK OPTION PLAN
 
     The following discussion is qualified in its entirety by the text of the
1993 Stock Option Plan which is attached hereto as Appendix F.
 
     THE M&I BOARD OF DIRECTORS RECOMMENDS A VOTE FOR APPROVAL OF THE 1993 STOCK
OPTION PLAN.
 
GENERAL
 
     At the Special Meeting, M&I shareholders will be requested to approve the
1993 Stock Option Plan which was adopted by the Board of Directors and the
Compensation Committee on December 16, 1993, subject to approval of the
shareholders at the Special Meeting. M&I currently has in effect the following
option plans: the 1979 Executive Stock Option Plan, the 1983 Executive Stock
Option and Restricted Stock Plan, the 1985 Executive Stock Option and Restricted
Stock Plan, the 1986 Non-Qualified Stock Option Plan, the Restricted Stock Plan
and the 1989 Executive Stock Option and Restricted Stock Plan. No additional
options or stock appreciation rights may be granted under the 1979 Option Plan.
As of the M&I Record Date, a total of 792,001 shares of M&I Common Stock
remained available for option grants under M&I's existing stock option plans and
4,143,782 shares of M&I Common Stock were subject to outstanding options under
such stock option plans. The 1993 Stock Option Plan is being proposed for
shareholder approval in order for M&I to meet its contractual obligations to
grant certain options to Valley executive officers pursuant to the New
Employment Agreements (see "-- Options to be Granted Under the 1993 Stock Option
Plan," below) and to make options available for grants to officers and key
employees of M&I.
 
     The Board of Directors believes that the adoption of the 1993 Stock Option
Plan is desirable since it will serve to promote the interests of M&I and its
shareholders by strengthening M&I's ability to attract and retain officers and
key employees and by encouraging them to maintain their personal interest in
M&I's continued success and progress.
 
     The complete text of the 1993 Stock Option Plan is set forth as Appendix F
to this Joint Proxy Statement-Prospectus. The following summary of the material
features of the 1993 Stock Option Plan does not purport to be complete and is
qualified in its entirety by reference to Appendix F.
 
M&I COMMON STOCK SUBJECT TO THE 1993 STOCK OPTION PLAN
 
     The 1993 Stock Option Plan provides for the grant of non-qualified stock
options and incentive stock options (collectively, "options") to those full-time
employees of M&I and its subsidiaries designated by the Stock Option Committee
(the "Committee") (such employees are hereafter referred to as "Participants").
Under the 1993 Stock Option Plan, the maximum number of shares which may be
issued or sold (subject to adjustment for certain events as described below) is
3,000,000 shares of M&I Common Stock. The shares may consist of treasury shares
or unissued shares, or a combination of both. Upon the expiration or termination
(whether by voluntary surrender, lapse of time or otherwise), in whole or in
part, of unexercised options, the shares of M&I Common Stock subject thereto
will again be available for regrant as options under the 1993 Stock Option Plan.
As a result, if the market price of the M&I Common Stock were to decline below
the option exercise price, a Participant could voluntarily surrender any options
then held by such person and such options would be available (in the discretion
of the Committee (as defined below)) for regrant to the same or another
Participant.
 
ADMINISTRATION
 
     The Plan will be administered by the Committee, designated from time to
time by M&I's Board of Directors, and it shall be so constituted as to permit
the Plan to comply with Rule 16b-3 of the Exchange Act, Section 162(m) of the
Code or any successor rule or other regulatory requirements. Presently Rule
16b-3 provides that none of the members of the Committee shall be eligible to
participate in the 1993 Stock Option Plan or in any other stock-based plan of
the Company that provides for discretionary awards. The Committee will have sole
discretion to determine the employees to whom and the times at which options
will be granted, to interpret the 1993 Stock Option Plan, to prescribe, amend
and rescind rules and regulations pertaining to the 1993 Stock Option Plan and
to make all determinations and interpretations which it deems necessary or
 
                                       64
<PAGE>   70
 
advisable for the administration of the 1993 Stock Option Plan. A decision of
the Committee with regard to any of the foregoing matters will be conclusive and
binding.
 
ELIGIBILITY
 
     Participants under the 1993 Stock Option Plan will be limited to full-time
employees of M&I, or of any subsidiary of M&I. Directors who are not full-time
employees will not be eligible to participate under the 1993 Stock Option Plan.
In granting options, the Committee is required to take into account the duties
of the respective employees, their present and potential contributions to M&I's
success and such other factors as the Committee may deem relevant to the 1993
Stock Option Plan's purposes. It is estimated that approximately 500 persons may
be considered to be eligible to participate in the 1993 Stock Option Plan, all
of whom are officers of M&I and its subsidiaries. No Participant may receive
options for more than 600,000 of the shares available for grant under the 1993
Stock Option Plan during the term of the Plan (subject to adjustment for certain
events as described below).
 
OPTIONS TO BE GRANTED UNDER THE 1993 STOCK OPTION PLAN
 
     The following table sets forth non-qualified options granted to M&I
officers (options with respect to 383,000 shares of M&I Common Stock) none of
whom are executive officers of M&I, subject to shareholder approval of the 1993
Stock Option Plan, and non-qualified options to be granted to Valley officers
under the 1993 Stock Option Plan pursuant to the New Employment Agreements. See
"CERTAIN RELATED TRANSACTIONS -- Employment Agreements and Related Matters." All
such options will have an exercise price per share equal to the market price per
share of M&I Common Stock on the business day immediately preceding the date of
grant, which was $22.75 on December 15, 1993 in the case of the options granted
to the M&I officers, and which is expected to be the market price on the
business day immediately preceding the Effective Time in the case of the options
granted to the Valley officers pursuant to the New Employment Agreements,
assuming shareholder approval. No determination has been made as to any other
options to be granted under the 1993 Stock Option Plan.
 
                                       65
<PAGE>   71
 
                               NEW PLAN BENEFITS
         MARSHALL & ILSLEY CORPORATION 1993 EXECUTIVE STOCK OPTION PLAN
 
<TABLE>
<CAPTION>
                                                                      NO. OF SHARES OF M&I COMMON
                       NAME AND POSITION(1)                            STOCK SUBJECT TO OPTIONS
- -------------------------------------------------------------------   ---------------------------
<S>                                                                   <C>
Peter M. Platten, III, Vice Chairman of the Board(2)...............              100,000
Mark L. Miller, Senior Vice President..............................               20,000
Gary A. Lichtenberg, Senior Vice President(2)......................               40,000
Charles H. Sauter, Senior Vice President...........................               40,000
Sal A. Troia, Senior Vice President................................               20,000
M&I Executive Officer Group(3).....................................              140,000
Non-Executive Officer Director Group...............................                    0
Non-Executive Officer Employee Group(4)............................              463,000
</TABLE>
 
- -------------------------
(1) Position with M&I at the Effective Time.
(2) Executive officer of M&I at the Effective Time.
(3) Consists of options to be granted at the Effective Time to Messrs. Platten
     and Lichtenberg.
(4) Consists of options with respect to 80,000 shares to be granted at the
     Effective Time to Messrs. Miller, Sauter and Troia as set forth in the
     table and options with respect to 383,000 shares granted to M&I officers as
     discussed above.
 
GENERAL CONDITIONS; TERMINATION OF EMPLOYMENT
 
     Options may be granted by the Committee to participants in such number and
at such times during the term of the 1993 Stock Option Plan as the Committee
shall determine. The Committee will determine with respect to each option the
nature and extent of the restrictions, if any, to be imposed on the exercise of
the options.
 
     Any Participant whose employment with M&I or a subsidiary is terminated for
any reason other than for retirement, death, disability or Cause shall have
three months from the date of such termination of employment to exercise any
option granted under the 1993 Stock Option Plan (to the extent then
exercisable), except that executive officers may have a longer period to
exercise if termination of employment occurs in connection with a "Triggering
Event" (certain change in control transactions of M&I). If employment is
terminated due to retirement on such Participant's normal retirement date (as
defined in the M&I Retirement Growth Plan), early retirement with the consent of
the Committee, or disability (as defined in Section 22(e)(3) of the Code), the
Participant will have one year from the date of termination to exercise any
option granted under the 1993 Stock Option Plan (to the extent then
exercisable). In the event of the death of a Participant while in the employ of
M&I or a subsidiary, options held by such Participant will be exercisable for
one year after such Participant's death by the personal representative,
administrator or other representative of the estate of the deceased Participant
or other person or persons to whom the deceased Participant's rights under the
option will pass by will or the laws of descent and distribution; provided,
however, that such option will be exercisable only to the extent that the
deceased Participant would have been entitled to exercise such option on the
date of such Participant's death. If a Participant's employment is terminated
for Cause, to the extent any option has not been effectively exercised prior to
such termination, it will lapse immediately upon termination of employment.
"Cause" is defined as the discharge of an employee on account of fraud or
embezzlement against M&I or its subsidiaries or serious and willful acts of
misconduct detrimental to the business of M&I or its subsidiaries or their
reputations. The Committee may, in its sole discretion, increase the periods
permitted for exercise of an option following termination of employment under
any of the circumstances described above, if allowable under applicable law
(however, any extension for reasons other than death will result in an incentive
stock option becoming a non-qualified stock option). In no event will any
incentive stock option granted under the 1993 Stock Option Plan be exercisable
more than ten years after the date of grant of such option.
 
     During the lifetime of a Participant, options granted to that Participant
under the 1993 Stock Option Plan will be nontransferable. In addition, such
options will be exercisable only by such Participant. However, a Participant
will have the right to transfer any option granted to such Participant upon such
Participant's death, either by the terms of such Participant's will or under the
laws of descent and distribution; provided, however,
 
                                        66
<PAGE>   72
 
that all distributees shall be subject to the terms and conditions of the 1993
Stock Option Plan to the extent such terms and conditions would apply to the
Participant if still alive, except as may otherwise expressly be provided in the
1993 Stock Option Plan or be determined by the Committee.
 
     If an option agreement provides that a holder must be employed by M&I or a
subsidiary for a designated period before an option becomes exercisable, such
option will become immediately exercisable upon the occurrence of a Triggering
Event.
 
TERMS AND CONDITIONS OF NON-QUALIFIED STOCK OPTIONS
 
     All non-qualified stock options granted under the 1993 Stock Option Plan
will be options which do not meet the requirements of Section 422 of the Code
and will be subject to the following terms and conditions: (i) the option
exercise price per share will be the fair market value of M&I Common Stock on
the date of grant of such option (defined as the market price for M&I Common
Stock on the business day immediately preceding the date of grant) and (ii) the
shares covered by a non-qualified stock option may not be purchased for six
months after the date on which the option is granted, or such longer period as
the Committee may determine in a particular case, but thereafter may be
purchased at one time or in such installments over the balance of the option
period as may be provided in the option agreement relating to such option.
Payment of the exercise price of non-qualified stock options may be made with
M&I Common Stock already owned by the participant and held for more than six
months. A Participant exercising non-qualified stock options may satisfy his
obligation for payment of withholding taxes either by having M&I retain a number
of shares otherwise issuable upon exercise sufficient in value to equal the
amount of the withholding tax or by delivering to M&I shares of M&I Common Stock
already owned by the Participant equal in value to the amount of the withholding
tax. Any election by a person subject to Section 16 of the Exchange Act to
withhold or deliver shares of M&I Common Stock may be made only during such
times as permitted by Rule 16b-3 and may be disapproved by the Committee at any
time after the election. Participants may be required to make such
representations and warranties and to agree to such other terms and conditions
as will be necessary in the opinion of counsel to M&I to comply with all
applicable Federal and state securities laws.
 
TERMS AND CONDITIONS OF INCENTIVE STOCK OPTIONS
 
     The Committee may grant incentive stock options as defined under Section
422 of the Code. All incentive stock options, except for the provisions
described in this paragraph, will be subject to the same terms and conditions as
described under "Terms and Conditions of Non-Qualified Stock Options." The per
share option exercise price of the shares subject to any incentive stock option
will be determined by the Committee but will not be less than 100% of the fair
market value per share of M&I Common Stock on the date of the grant of such
option. The fair market value per share on the date of grant shall be the market
price for the business day immediately preceding the date of grant of such
option. No incentive stock option will (i) be granted after 10 years from the
date this Plan was adopted by M&I's Board of Directors, or (ii) be exercisable
more than 10 years after the date the option is granted. Under the 1993 Stock
Option Plan, the aggregate fair market value (determined at the time the option
is granted) of the M&I Common Stock with respect to which incentive stock
options are exercisable for the first time during any calendar year under any
incentive stock option plan may not exceed $100,000 per Participant, or any
other limit as may be prescribed by the Code from time to time.
 
ADJUSTMENT IN EVENT OF CAPITAL CHANGES
 
     The 1993 Stock Option Plan provides that the Board of Directors of M&I may,
upon the recommendation of the Committee, make equitable adjustments designed to
protect against dilution in respect of the number and kind of shares authorized
for issuance under the 1993 Stock Option Plan (including shares as to which
options have been granted but which remain unexercised and shares reserved for
options) in the event of any change in M&I's capitalization, including
recapitalizations, stock splits, stock dividends and similar transactions. In
the event of a merger, consolidation or any other transaction as a result of
which the M&I Common Stock will cease to be registered under Section 12 of the
Securities Exchange Act of 1934 or listed on any national securities exchange or
authorized to be quoted on an inter-dealer quotation system of a
 
                                       67
<PAGE>   73
registered national securities association, each outstanding option will pertain
to and apply to the securities which a holder of the number of shares subject to
the option would have been entitled to receive pursuant to such transaction,
with any such adjustment in the exercise price as the Committee shall deem
appropriate. A dissolution of M&I or a sale of all or substantially all the
assets and property of M&I will cause each outstanding option to terminate
forthwith; provided, however, that the holders of outstanding options may
exercise such options to the extent exercisable immediately prior to such
dissolution or sale.
 
DURATION AND AMENDMENT OF THE 1993 STOCK OPTION PLAN
 
     No incentive stock option may be granted pursuant to the 1993 Stock Option
Plan after December 15, 2003. The Board of Directors may at any time terminate
the 1993 Stock Option Plan with respect to any shares of M&I not at the time
subject to an outstanding option and may alter or amend the 1993 Stock Option
Plan (including, but without limiting the generality of the foregoing, any
amendment deemed necessary to ensure that M&I may obtain any required regulatory
approval); provided, however, that without the approval of M&I's stockholders,
no amendment may be made which would cause the Plan to no longer comply with
Rule 16b-3 under the Exchange Act, or any successor rule or other regulatory
requirements. Presently, Rule 16b-3 forbids any amendment without shareholder
approval that, with respect to persons subject to Section 16 of the Exchange
Act, (i) materially increases the number of shares which may be issued under the
Plan (except in the case of adjustments in the event of capital changes as
described above), (ii) materially increases the benefits accruing to
Participants under the Plan, or (iii) materially modifies the requirements for
eligibility for participation in the Plan.
 
     It is intended that the Plan and any award made to a person subject to
Section 16 of the Exchange Act, and any transaction or election thereunder by
any such person, meet all of the requirements of Rule 16b-3, promulgated by the
Commission, as such rule is currently in effect or as hereafter modified or
amended. If any provision of the Plan or any award hereunder would disqualify
the Plan or such award under, or would not comply with, Rule 16b-3, such
provision or award shall be construed or deemed amended to conform to Rule
16b-3.
 
ACCOUNTING TREATMENT OF OPTIONS
 
     Under existing accounting rules, M&I incurs no compensation expense upon
the grant of a stock option with an exercise price at least equal to the fair
market value of the M&I Common Stock on the date of grant. On June 30, 1993, the
Financial Accounting Standards Board issued an exposure draft (the "Exposure
Draft") that would require companies to recognize an expense for all stock-based
compensation awards, including stock options, granted after December 31, 1996.
For options, the expense would equal the fair value of the option on the grant
date and would be recognized over the vesting period of the option. The options
would be valued using a pricing model, such as Black-Scholes, as adjusted for
factors unique to employee options. If the Exposure Draft is adopted in its
current form, beginning with fiscal 1994, M&I would be required to provide
footnote disclosures, including disclosures of the effect on net income and
earnings per share, as if the new recognition requirements were in effect.
 
TAX STATUS OF OPTIONS
 
     Non-Qualified Stock Options. A Participant will not be deemed to have
received taxable income upon the grant of a non-qualified stock option. Upon the
exercise of a non-qualified stock option, a Participant generally will be deemed
to have received income, taxable for federal income tax purposes at ordinary
income rates, equal to the excess of the fair market value of the M&I Common
Stock received on the date of exercise over the option price. However, if the
sale of such stock at a profit would subject the Participant to suit under
Section 16(b) of the Exchange Act, the Participant will not recognize income due
to the exercise of the option (unless the Participant elects to be taxed upon
exercise under Section 83(b) of the Code) until the Participant ceases to be
subject to this provision, at which time the Participant will recognize as
ordinary income an amount equal to the excess of the then fair market value of
the M&I Common Stock issued upon exercise over the option price.
 
                                       68
<PAGE>   74
 
     Upon the exercise of a non-qualified stock option, M&I or a subsidiary will
be entitled to a deduction for Federal income tax purposes in an amount equal to
the amount included in income by the Participant as a result of such exercise
provided (i) M&I withholds on such income and (ii) the requirements of Section
162(m) of the Code are met. As regards a stock option plan, Section 162(m) is
satisfied if (a) the Compensation Committee of the Board of Directors and a
majority of the shareholders approve the Plan after disclosure of its material
terms and the maximum number of shares which can be awarded to any executive and
(b) the option exercise price is the fair market value of M&I Common Stock on
the date of grant of the option. The Plan is intended to satisfy these
requirements. This deduction will be available in the tax year of M&I in which
the Participant recognizes the income.
 
     The income arising from a Participant exercising a non-qualified stock
option will be subject to withholding for income tax purposes, and M&I will be
entitled to defer making delivery of any stock to be issued until satisfactory
withholding arrangements have been made. The basis of shares received upon the
exercise of a non-qualified stock option will be the option exercise price paid
plus the amount recognized by the Participant as taxable income attributable to
such shares as a result of the exercise. Gain or loss recognized by the
Participant on a subsequent disposition of any such shares will be capital gain
or loss if such shares constitute a capital asset in the hands of the
Participant. A Participant's holding period will commence on the date of
exercise. However, if a Participant is subject to Section 16(b) of the Exchange
Act with respect to any option shares, there will be included only the period
beginning at the time the restriction lapses or, if the election under Section
83(b) of the Code is made, at the time of exercise.
 
     Incentive Stock Options. Participants will not be deemed to recognize
taxable income upon the grant or exercise of an incentive stock option. If a
Participant makes no disqualifying disposition of the option stock within the
one year period beginning after the transfer of such stock to the Participant
nor within two years from the date of granting of the option, and if the
Participant at all times from the date of the granting of the incentive stock
option to a date three months before the date of exercise has been an employee
of M&I or a subsidiary, any gain recognized on the disposition of the option
stock will be long-term capital gain. (In the case of a Participant who is
disabled, within the meaning of Section 22(e)(3) of the Code, or dies, the
three-month period is extended to twelve months.) The difference between the
fair market value of the stock and the exercise price will, however, be an item
of tax preference, and may subject a Participant to the alternative minimum tax.
M&I and its subsidiaries will not be entitled to any deduction with respect to
the option stock issued.
 
     If the Participant makes a disqualifying disposition of the option stock
before the expiration of the one or two year holding periods described above,
the Participant will be deemed to have received income, taxable for federal
income tax purposes at ordinary rates, at the time of such disposition to the
extent that the fair market value of the option stock at the time of exercise
(or, if less, the amount realized on such disposition) exceeds the option price.
To the extent that the amount realized on such disposition exceeds the fair
market value of the option stock at the time of exercise, such excess will be
taxed as capital gain if the option stock is otherwise a capital asset in the
hands of the Participant. To the extent the Participant realizes ordinary income
on a disqualifying disposition of the option stock, M&I or a subsidiary may be
entitled to a deduction for federal income tax purposes in an amount equal to
the ordinary income recognized by the Participant.
 
     The closing sales price of M&I Common Stock on the NASDAQ/NMS on December
28, 1993 was $24 per share.
 
                         CERTAIN INFORMATION CONCERNING
                                 M&I AND VALLEY
 
     Information regarding the names, ages, positions and business backgrounds
of the executive officers and directors of M&I and Valley, respectively, as well
as additional information, including executive compensation, security ownership
of certain beneficial owners and management and certain relationships and
related transactions, is incorporated herein by reference to their respective
Annual Reports on Form 10-K for the year ended December 31, 1992, each of which
incorporates portions of their respective Proxy Statements for the 1993 Annual
Meeting of Shareholders.
 
                                       69
<PAGE>   75
 
     On November 5, 1993, M&I Marshall & Ilsley Bank, a bank subsidiary of M&I
(acting for itself and for certain other subsidiaries of M&I), and Valley
entered into a line of credit arrangement (the "Line of Credit") whereby M&I
Marshall & Ilsley Bank agreed to provide credit of up to $50,000,000 to Valley.
This Line of Credit replaced a line of credit between M&I Marshall & Ilsley Bank
and Valley for $25,000,000 entered into in June 1990. Under the Line of Credit,
Valley has borrowed, as of December 10, 1993, an aggregate of $43,500,000,
consisting of $21,500,000 aggregate principal amount bearing interest at the
annual rate of 3.77% and $22,000,000 aggregate principal amount bearing interest
at the annual rate of 4.09%. At December 10, 1993, accrued interest under the
Line of Credit was $26,502. Borrowings under the Line of Credit must be repaid
by Valley upon demand of M&I Marshall & Ilsley Bank. Funds borrowed under the
Line of Credit were used by Valley for general corporate purposes.
 
     M&I Data Services, Inc., a subsidiary of M&I ("M&I Data Services"), and
Valley BankService Corporation, a subsidiary of Valley ("Valley BankService"),
have entered into a Management Services Agreement dated as of November 10, 1993
(the "Management Services Agreement") pursuant to which M&I Data Services has
been retained to provide management services to Valley BankService and to
establish a schedule and plan to convert Valley BankService's data processing
systems to M&I Data Services' service bureau processing. Under the Management
Services Agreement, M&I Data Services receives a monthly fee of $30,000, plus
reimbursement of certain reasonable out-of-pocket expenses. M&I is also entitled
to receive for its management services incentive payments out of any costs
savings realized by Valley BankService. M&I and Valley believe that the
Management Services Agreement is the result of arms-length negotiations between
the parties and contains similar terms to agreements negotiated between M&I Data
Services and unrelated parties.
 
     M&I Data Services and Valley are currently negotiating a Data Processing
Services Agreement (the "Data Processing Agreement") pursuant to which M&I Data
Services would perform certain financial service products data processing
services for Valley at M&I Data Service's then current standard published
prices, subject to certain discounts, plus reimbursement of certain conversion
and start-up charges including reasonable out-of-pocket expenses. It is
anticipated that the Data Processing Agreement will have an initial term of six
years, and on each anniversary would be renewed for an additional year absent
advance notice to the contrary, thereby restoring the full term of the Data
Processing Agreement to six years. M&I and Valley believe that any such Data
Processing Agreement would be the result of arms-length negotiations between the
parties and would contain similar terms to agreements negotiated between M&I
Data Services and unrelated parties.
 
                                    EXPERTS
 
     The consolidated financial statements of M&I and its subsidiaries and
Valley and its subsidiaries incorporated by reference in this Joint Proxy
Statement-Prospectus and elsewhere in the Registration Statement, have been
audited by Arthur Andersen & Co., independent public accountants, as indicated
in their reports with respect thereto, which are incorporated herein by
reference, and are included herein in reliance upon the authority of said firm
as experts in accounting and auditing in giving said reports.
 
                                 LEGAL OPINIONS
 
     The validity of the M&I Common Stock to be issued in connection with the
Merger will be passed upon for M&I by Godfrey & Kahn, S.C., Milwaukee,
Wisconsin.
 
                                       70
<PAGE>   76
 
                             SHAREHOLDER PROPOSALS
 
     M&I's Annual Meeting, previously scheduled for April 26, 1994, has been
rescheduled for August 23, 1994. In accordance with M&I's By-Laws, nominations
other than by or at the direction of the M&I Board of Directors must be
submitted to M&I not later than July 21, 1994. Any M&I shareholder who wishes to
submit a proposal for presentation to the 1994 Annual Meeting of Shareholders of
M&I must submit the proposal in writing to M&I, 770 North Water Street,
Milwaukee, Wisconsin 53202, Attention: M.A. Hatfield, Secretary, by January 28,
1994 for inclusion, if appropriate, in M&I's proxy statement and the form of
proxy relating to the 1994 Annual Meeting. To avoid disputes as to the date of
receipt, it is suggested that any shareholder proposal be submitted by certified
mail, return receipt requested.
 
                                       71
<PAGE>   77
 
                                                                      APPENDIX A
 
                          AGREEMENT AND PLAN OF MERGER
                                    BETWEEN
                             VALLEY BANCORPORATION
                                      AND
                         MARSHALL & ILSLEY CORPORATION
 
                         DATED AS OF SEPTEMBER 19, 1993
<PAGE>   78
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                         PAGE
                                                                                         ----
ARTICLE I -- THE MERGER
<S>               <C>                                                                    <C>
  SECTION 1.1     The Merger...........................................................   A-1
  SECTION 1.2     Effective Time.......................................................   A-1
  SECTION 1.3     Effect of the Merger.................................................   A-1
  SECTION 1.4     Articles of Incorporation; By-Laws...................................   A-1
  SECTION 1.5     Directors and Officers...............................................   A-1
  SECTION 1.6     Conversion of Securities.............................................   A-2
  SECTION 1.7     Exchange of Certificates.............................................   A-2
  SECTION 1.8     Stock Transfer Books.................................................   A-4
  SECTION 1.9     Anti-Dilution Provisions.............................................   A-4
<CAPTION>
ARTICLE II -- REPRESENTATIONS AND WARRANTIES OF SELLER
<S>               <C>                                                                    <C>
  SECTION 2.1     Organization and Qualification; Subsidiaries.........................   A-4
  SECTION 2.2     Articles of Incorporation and By-Laws................................   A-5
  SECTION 2.3     Capitalization.......................................................   A-5
  SECTION 2.4     Authority............................................................   A-6
  SECTION 2.5     No Conflict; Required Filings and Consents...........................   A-6
  SECTION 2.6     Compliance; Permits..................................................   A-7
  SECTION 2.7     Securities and Banking Reports; Financial Statements.................   A-7
  SECTION 2.8     Absence of Certain Changes or Events.................................   A-8
  SECTION 2.9     Absence of Litigation................................................   A-8
  SECTION 2.10    Employee Benefit Plans...............................................   A-9
  SECTION 2.11    Registration Statement; Joint Proxy Statement........................  A-10
  SECTION 2.12    Title to Property....................................................  A-11
  SECTION 2.13    Environmental Matters................................................  A-11
  SECTION 2.14    Absence of Agreements................................................  A-12
  SECTION 2.15    Taxes................................................................  A-12
  SECTION 2.16    Insurance............................................................  A-13
  SECTION 2.17    Brokers..............................................................  A-13
  SECTION 2.18    Accounting and Tax Matters...........................................  A-13
  SECTION 2.19    Material Adverse Effect..............................................  A-13
  SECTION 2.20    Material Contracts...................................................  A-13
  SECTION 2.21    Full Disclosure......................................................  A-13
  SECTION 2.22    Opinion of Financial Advisor.........................................  A-13
  SECTION 2.23    Vote Required........................................................  A-14
<CAPTION>
ARTICLE III -- REPRESENTATIONS AND WARRANTIES OF THE COMPANY
<S>               <C>                                                                    <C>
  SECTION 3.1     Organization and Qualification; Subsidiaries.........................  A-14
  SECTION 3.2     Articles of Incorporation and By-Laws................................  A-14
  SECTION 3.3     Capitalization.......................................................  A-15
  SECTION 3.4     Authority............................................................  A-15
  SECTION 3.5     No Conflict; Required Filings and Consents...........................  A-15
  SECTION 3.6     Compliance; Permits..................................................  A-16
  SECTION 3.7     Securities and Banking Reports; Financial Statements.................  A-16
  SECTION 3.8     Absence of Certain Changes or Events.................................  A-17
  SECTION 3.9     Absence of Litigation................................................  A-17
  SECTION 3.10    Employee Benefit Plans...............................................  A-18
  SECTION 3.11    Registration Statement; Joint Proxy Statement........................  A-18
  SECTION 3.12    Title to Property....................................................  A-19
  SECTION 3.13    Environmental Matters................................................  A-19
  SECTION 3.14    Absence of Agreements................................................  A-19
</TABLE>
 
                                       A-i
<PAGE>   79
 
<TABLE>
<CAPTION>
                                                                                         PAGE
                                                                                         ----
<S>               <C>                                                                    <C>
  SECTION 3.15    Taxes................................................................  A-20
  SECTION 3.16    Brokers..............................................................  A-20
  SECTION 3.17    Accounting and Tax Matters...........................................  A-20
  SECTION 3.18    Material Adverse Effect..............................................  A-20
  SECTION 3.19    Material Contracts...................................................  A-21
  SECTION 3.20    Full Disclosure......................................................  A-21
  SECTION 3.21    Opinion of Financial Adviser.........................................  A-21
  SECTION 3.22    Vote Required........................................................  A-21
<CAPTION>
ARTICLE IV -- COVENANTS OF SELLER
<S>               <C>                                                                    <C>
  SECTION 4.1     Affirmative Covenants................................................  A-21
  SECTION 4.2     Negative Covenants...................................................  A-21
  SECTION 4.3     Letter of Seller's Accountants.......................................  A-24
  SECTION 4.4     Access and Information...............................................  A-24
  SECTION 4.5     Update Disclosure; Breaches..........................................  A-25
  SECTION 4.6     Affiliates; Accounting and Tax Treatment.............................  A-25
  SECTION 4.7     Expenses.............................................................  A-25
  SECTION 4.8     Delivery of Shareholder List.........................................  A-26
  SECTION 4.9     Company Representatives..............................................  A-26
<CAPTION>
ARTICLE V -- COVENANTS OF THE COMPANY
<S>               <C>                                                                    <C>
  SECTION 5.1     Affirmative Covenants................................................  A-26
  SECTION 5.2     Negative Covenants...................................................  A-26
  SECTION 5.3     Access and Information...............................................  A-26
  SECTION 5.4     Update Disclosure; Breaches..........................................  A-27
  SECTION 5.5     Stock Exchange Listing...............................................  A-27
  SECTION 5.6     Company Board of Directors...........................................  A-27
  SECTION 5.7     Accounting and Tax Treatment.........................................  A-27
  SECTION 5.8     Employment Matters...................................................  A-27
<CAPTION>
ARTICLE VI -- ADDITIONAL AGREEMENTS
<S>               <C>                                                                    <C>
  SECTION 6.1     Joint Proxy Statement; Registration Statement........................  A-27
  SECTION 6.2     Meetings of Shareholders.............................................  A-28
  SECTION 6.3     Appropriate Action; Consents; Filings................................  A-28
  SECTION 6.4     Employee Stock Options and Other Employee Benefit Matters............  A-28
  SECTION 6.5     Directors' and Officers' Indemnification and Insurance...............  A-29
  SECTION 6.6     Notification of Certain Matters......................................  A-30
  SECTION 6.7     Public Announcements.................................................  A-30
<CAPTION>
ARTICLE VII -- CONDITIONS OF MERGER
<S>               <C>                                                                    <C>
  SECTION 7.1     Conditions to Obligation of Each Party to Effect the Merger..........  A-30
  SECTION 7.2     Additional Conditions to Obligations of the Company..................  A-31
  SECTION 7.3     Additional Conditions to Obligations of Seller.......................  A-32
<CAPTION>
ARTICLE VIII -- TERMINATION, AMENDMENT AND WAIVER
<S>               <C>                                                                    <C>
  SECTION 8.1     Termination..........................................................  A-33
  SECTION 8.2     Investigation and Review.............................................  A-35
  SECTION 8.3     Effect of Termination................................................  A-35
  SECTION 8.4     Amendment............................................................  A-35
  SECTION 8.5     Waiver...............................................................  A-35
<CAPTION>
ARTICLE IX -- GENERAL PROVISIONS
<S>               <C>                                                                    <C>
  SECTION 9.1     Non-Survival of Representations, Warranties and Agreements...........  A-36
  SECTION 9.2     Notices..............................................................  A-36
  SECTION 9.3     Certain Definitions..................................................  A-36
  SECTION 9.4     Headings.............................................................  A-37
</TABLE>
 
                                      A-ii
<PAGE>   80
 
<TABLE>
<CAPTION>
                                                                                         PAGE
                                                                                         ----
<S>                                                                                      <C>
  SECTION 9.5     Severability.........................................................  A-37
  SECTION 9.6     Entire Agreement.....................................................  A-37
  SECTION 9.7     Assignment...........................................................  A-37
  SECTION 9.8     Parties in Interest..................................................  A-37
  SECTION 9.9     Governing Law........................................................  A-37
  SECTION 9.10    Counterparts.........................................................  A-38
  SECTION 9.11    Disclosure Schedules.................................................  A-38
ANNEX A ADDITIONAL DIRECTORS AND OFFICERS OF THE SURVIVING CORPORATION.................
                                                                                         A-39
ANNEX B SUBSIDIARIES OF SELLER.........................................................     *
ANNEX C EMPLOYEE AND DIRECTOR STOCK OPTIONS AND OTHER EMPLOYEE BENEFIT MATTERS**.......
                                                                                         A-40
ANNEX D FORM OF OPINION OF COUNSEL TO SELLER...........................................  A-43
ANNEX E FORM OF OPINION OF COUNSEL TO COMPANY..........................................  A-45
EXHIBIT 4.6 AFFILIATE LETTER...........................................................  A-47
EXHIBIT 8.1 INDEX GROUP................................................................  A-49
</TABLE>
 
- -------------------------
 * Omitted from Joint Proxy Statement-Prospectus.
 
** Attachments omitted from Joint Proxy Statement-Prospectus.
 
                                      A-iii
<PAGE>   81
 
                             INDEX OF DEFINED TERMS
 
<TABLE>
<CAPTION>
                                                                            SECTION
                                                                          ------------
<S>                                                                       <C>
Affiliate..............................................................   SECTION 9.3 (a)
Agreement..............................................................   PREAMBLE
Articles of Merger.....................................................   SECTION 1.2
Beneficial Owner.......................................................   SECTION 9.3 (b)
BHCA...................................................................   SECTION 2.1 (a)
Blue Sky Laws..........................................................   SECTION 2.5 (b)
Business Day...........................................................   SECTION 9.3 (c)
Certificates...........................................................   SECTION 1.7 (b)
Code...................................................................   PREAMBLE
Company................................................................   PREAMBLE
Company Approvals......................................................   SECTION 3.1 (a)
Company Articles.......................................................   SECTION 1.4
Company Articles Amendment.............................................   SECTION 3.2
Company Average Price..................................................   SECTION 8.1 (a)
Company Balance Sheet..................................................   SECTION 3.7 (d)
Company By-Laws........................................................   SECTION 1.4
Company Common Stock...................................................   SECTION 1.6 (a)
Company Disclosure Schedule............................................   ARTICLE III,
                                                                          PREAMBLE
Company Plans..........................................................   SECTION 3.10(a)
Company Preferred Stock................................................   SECTION 3.3 (a)
Company Property.......................................................   SECTION 3.13(b)
Company Reports........................................................   SECTION 3.7 (b)
Company SEC Reports....................................................   SECTION 3.7 (a)
Company Series A Preferred Stock.......................................   SECTION 3.3 (a)
Company Shareholders Meeting...........................................   SECTION 2.11
Company Subsidiary.....................................................   SECTION 3.1 (a)
Company Subsidiaries...................................................   SECTION 3.1 (a)
Competing Transaction..................................................   SECTION 4.2 (e)
Control................................................................   SECTION 9.3 (d)
Effective Time.........................................................   SECTION 1.2
Environmental Claims...................................................   SECTION 2.13(b)
Environmental Law......................................................   SECTION 2.13(b)
Environmental Permits..................................................   SECTION 2.13(b)
ERISA..................................................................   SECTION 2.10(a)
Exchange Act...........................................................   SECTION 2.5 (b)
Exchange Agent.........................................................   SECTION 1.7 (a)
Exchange Fund..........................................................   SECTION 1.7 (a)
Exchange Rate..........................................................   SECTION 1.6 (a)
Expenses...............................................................   SECTION 4.7 (b)
FDIC...................................................................   SECTION 2.1 (a)
Fed Approval Date......................................................   SECTION 8.1 (a)
Final Index Price......................................................   SECTION 8.1 (a)
Final Price............................................................   SECTION 8.1 (a)
Hazardous Materials....................................................   SECTION 2.13(b)
HOLA...................................................................   SECTION 2.1 (a)
Indemnified Parties....................................................   SECTION 6.5 (c)
Index Group............................................................   SECTION 8.1 (a)
Initial Index Price....................................................   SECTION 8.1 (a)
IRS....................................................................   SECTION 2.15
</TABLE>
 
                                      A-iv
<PAGE>   82
 
<TABLE>
<CAPTION>
                                                                            SECTION
                                                                          ------------
<S>                                                                       <C>
ISO....................................................................   SECTION 2.10(g)
Joint Proxy Statement..................................................   SECTION 2.11
Laws...................................................................   SECTION 2.5 (a)
Material Adverse Effect................................................   SECTION 2.1 (d)
Measurement Period.....................................................   SECTION 7.2 (l)
Merger.................................................................   PREAMBLE
NASDAQ/NMS.............................................................   SECTION 1.7 (e)
OCC....................................................................   SECTION 2.1 (a)
OTS....................................................................   SECTION 2.1 (a)
Person.................................................................   SECTION 9.3 (e)
Plans..................................................................   SECTION 2.10(a)
Registration Statement.................................................   SECTION 3.11
SEC....................................................................   SECTION 2.7 (a)
Section 180.0622(2)(b) of the WBCL.....................................   SECTION 2.3
Securities Act.........................................................   SECTION 2.5 (b)
Seller.................................................................   PREAMBLE
Seller Approvals.......................................................   SECTION 2.1 (a)
Seller Articles........................................................   SECTION 2.2
Seller Balance Sheet...................................................   SECTION 2.7 (d)
Seller By-Laws.........................................................   SECTION 2.2
Seller Common Stock....................................................   SECTION 1.6 (a)
Seller Disclosure Schedule.............................................   ARTICLE II,
                                                                          PREAMBLE
Seller Preferred Stock.................................................   SECTION 2.3
Seller Reports.........................................................   SECTION 2.7 (b)
Seller Right...........................................................   SECTION 2.3
Seller Rights Agreement................................................   SECTION 2.3
Seller SEC Reports.....................................................   SECTION 2.7 (a)
Seller Series A Preferred Stock........................................   SECTION 2.3
Seller Subsidiaries....................................................   SECTION 2.1 (a)
Seller Subsidiary......................................................   SECTION 2.1 (a)
Seller Shareholders Meeting............................................   SECTION 2.11
Seller's Property......................................................   SECTION 2.13(b)
Shares.................................................................   SECTION 1.6 (a)
Significant Seller Subsidiaries........................................   SECTION 2.2
Significant Seller Subsidiary..........................................   SECTION 2.2
Stock Option Agreement.................................................   PREAMBLE
Subsidiary or Subsidiaries.............................................   SECTION 9.3 (f)
Surviving Corporation..................................................   SECTION 1.1
Tax or Taxes...........................................................   SECTION 2.15
Tax Returns............................................................   SECTION 2.15
WBL....................................................................   SECTION 2.5 (b)
WBCL...................................................................   PREAMBLE
Wisconsin Commissioner.................................................   SECTION 2.1 (a)
</TABLE>
 
                                       A-v
<PAGE>   83
 
                          AGREEMENT AND PLAN OF MERGER
 
     AGREEMENT AND PLAN OF MERGER, dated as of September 19, 1993 (the
"Agreement"), between Valley Bancorporation, a Wisconsin corporation (the
"Seller") and Marshall & Ilsley Corporation, a Wisconsin corporation (the
"Company").
 
     WHEREAS, the Boards of Directors of the Company and the Seller have each
determined that it is fair to and in the best interests of their respective
shareholders for the Seller to merge with and into the Company (the "Merger")
upon the terms and subject to the conditions set forth herein and in accordance
with the Wisconsin Business Corporation Law (the "WBCL");
 
     WHEREAS, the respective Boards of Directors of the Company and the Seller
have each approved the Merger of the Seller with and into the Company, upon the
terms and subject to the conditions set forth herein, and adopted this Merger
Agreement;
 
     WHEREAS, concurrently with this Agreement and as a condition and an
inducement to the willingness of the Company to enter into this Agreement,
Seller and the Company have entered into a stock option agreement granting the
Company, under the conditions set forth therein, the option to purchase shares
of newly issued Seller Common Stock (the "Stock Option Agreement");
 
     WHEREAS, for federal income tax purposes, it is intended that the Merger
shall qualify as a reorganization under the provisions of Section 368 of the
Internal Revenue Code of 1986, as amended (the "Code"); and
 
     WHEREAS, for financial accounting purposes it is intended that the Merger
shall be accounted for as a pooling of interests;
 
     NOW, THEREFORE, in consideration of the foregoing premises and the
representations, warranties and agreements contained herein, and subject to the
terms and conditions set forth herein, the parties hereto hereby agree as
follows:
 
                            ARTICLE I -- THE MERGER
 
     SECTION 1.1 THE MERGER. Upon the terms and subject to the conditions set
forth in this Agreement, and in accordance with the WBCL, at the Effective Time
(as defined in Section 1.2) Seller shall be merged with and into the Company. As
a result of the Merger, the separate corporate existence of Seller shall cease
and the Company shall continue as the surviving corporation of the Merger (the
"Surviving Corporation").
 
     SECTION 1.2 EFFECTIVE TIME. As promptly as practicable after the
satisfaction or, if permissible, waiver of the conditions set forth in Article
VII, the parties hereto shall cause the Merger to be consummated by filing
articles of merger (the "Articles of Merger") with the Secretary of State of the
State of Wisconsin, in such form as required by, and executed in accordance with
the relevant provisions of, the WBCL (the effective date and time specified in
the Articles of Merger is referred to herein as the "Effective Time").
 
     SECTION 1.3 EFFECT OF THE MERGER. At the Effective Time, the effect of the
Merger shall be as provided in this Agreement and the applicable provisions of
the WBCL. Without limiting the generality of the foregoing, and subject thereto,
at the Effective Time, except as otherwise provided herein, all the property,
rights, privileges, powers and franchises of the Company and the Seller shall
vest in the Surviving Corporation, and all debts, liabilities and duties of the
Company and the Seller shall become the debts, liabilities and duties of the
Surviving Corporation.
 
     SECTION 1.4 ARTICLES OF INCORPORATION; BY-LAWS. At the Effective Time, the
Articles of Incorporation, as amended (the "Company Articles") and the By-Laws,
as amended ("Company By-Laws") of the Company, as in effect immediately prior to
the Effective Time, shall be the Articles of Incorporation and the By-Laws of
the Surviving Corporation.
 
     SECTION 1.5 DIRECTORS AND OFFICERS. At the Effective Time, the directors of
the Company immediately prior to the Effective Time, together with the persons
set forth on Annex A, shall be the initial directors
 
                                       A-1
<PAGE>   84
 
of the Surviving Corporation, each to hold office in accordance with the
Articles of Incorporation and By-Laws of the Surviving Corporation and to be
assigned to the class previously assigned or as set forth on Annex A, as the
case may be. At the Effective Time, the officers of the Company immediately
prior to the Effective Time, together with the persons set forth on Annex A for
the offices set forth therein, shall be the initial officers of the Surviving
Corporation, in each case until their respective successors are duly elected or
appointed.
 
     SECTION 1.6 CONVERSION OF SECURITIES. Subject to Section 1.7(e) regarding
fractional shares, at the Effective Time:
 
          (a) each then-outstanding share of common stock, par value $0.50 per
     share, of Seller ("Seller Common Stock") (all issued and outstanding shares
     of Seller Common Stock being referred to herein as the "Shares"), other
     than Shares held in the treasury of Seller or owned by the Company for its
     own account, shall be converted in accordance with Section 1.7, into the
     right to receive 1.72 (the "Exchange Rate") shares of common stock, par
     value $1.00 per share, of the Company ("Company Common Stock"). All such
     shares of Seller Common Stock shall no longer be outstanding and shall
     automatically be cancelled and retired and shall cease to exist, and each
     certificate previously representing any such shares shall thereafter
     represent the right to receive a certificate representing shares of Company
     Common Stock into which such Seller Common Stock shall have been converted.
     Certificates previously representing shares of Seller Common Stock shall be
     exchanged for certificates representing whole shares of Company Common
     Stock issued in consideration therefor upon the surrender of such
     certificates in accordance with the provisions of Section 1.7, without
     interest. No fractional share of Company Common Stock shall be issued, and,
     in lieu thereof, a cash payment shall be made pursuant to Section 1.7
     hereof.
 
          (b) each Share held by the Seller as treasury stock immediately prior
     to the Effective Time shall be cancelled and extinguished without any
     conversion thereof into Company Common Stock or payment therefor.
 
          (c) each Share held by the Company for its own account shall be
     cancelled and extinguished without conversion thereof into Company Common
     Stock or payment therefor.
 
     SECTION 1.7 EXCHANGE OF CERTIFICATES.
 
          (a) Exchange Agent. As of the Effective Time, the Company shall
     deposit, or shall cause to be deposited, with a bank or trust company
     designated by the Company (the "Exchange Agent"), for the benefit of the
     holders of Shares, for exchange in accordance with this Article I, through
     the Exchange Agent, certificates representing the shares of Company Common
     Stock (such certificates for shares of Company Common Stock, together with
     any dividends or distributions with respect thereto are referred to herein
     as the "Exchange Fund") issuable pursuant to Section 1.6 in exchange for
     outstanding Shares.
 
          (b) Exchange Procedures. As soon as reasonably practicable after the
     Effective Time, the Exchange Agent shall mail to each holder of record of a
     certificate or certificates which immediately prior to the Effective Time
     represented Shares (the "Certificates"), whose Shares were converted into
     the right to receive shares of Company Common Stock pursuant to Section
     1.6, (i) a letter of transmittal (which shall specify that delivery shall
     be effected, and risk of loss and title to the Certificates shall pass,
     only upon delivery of the Certificates to the Exchange Agent and shall be
     in such form and have such other provisions as the Company may reasonably
     specify) and (ii) instructions for use in effecting the surrender of the
     Certificates in exchange for certificates representing shares of Company
     Common Stock. Upon surrender of a Certificate for cancellation to the
     Exchange Agent together with such letter of transmittal, duly executed, the
     holder of such Certificate shall be entitled to receive in exchange
     therefor a certificate representing that number of whole shares of Company
     Common Stock which such holder has the right to receive in respect of the
     Certificate surrendered pursuant to the provisions of this Article I (after
     taking into account all Shares then held by such holder), and the
     Certificate so surrendered shall forthwith be cancelled. In the event of a
     transfer of ownership of Shares which is not registered in the transfer
     records of the Seller, a certificate representing the proper number of
     shares of Company Common Stock may be issued to a transferee if the
     Certificate representing such Shares is presented to the Exchange Agent,
 
                                       A-2
<PAGE>   85
 
     accompanied by all documents required to evidence and effect such transfer
     and by evidence that any applicable stock transfer taxes have been paid. In
     the event any Certificate shall have been lost, stolen or destroyed, upon
     the making of an affidavit of that fact by the person claiming such
     Certificate to be lost, stolen or destroyed and the posting by such person
     of a bond in such reasonable amount as the Company may direct as indemnity
     against any claim that may be made against it or the Exchange Agent with
     respect to such Certificate, the Exchange Agent will issue in exchange for
     such lost, stolen or destroyed Certificate a certificate representing the
     proper number of shares of Company Common Stock. Until surrendered as
     contemplated by this Section 1.7, each Certificate shall be deemed at any
     time after the Effective Time to represent only the right to receive upon
     such surrender the certificate representing shares of Company Common Stock
     and cash in lieu of any fractional shares of Company Common Stock as
     contemplated by Section 1.7(e).
 
          (c) Distributions with Respect to Unexchanged Shares. No dividends or
     other distributions declared or made after the Effective Time with respect
     to Company Common Stock with a record date after the Effective Time shall
     be paid to the holder of any unsurrendered Certificate with respect to the
     shares of Company Common Stock represented thereby, and no cash payment in
     lieu of fractional shares shall be paid to any such holder pursuant to
     Section 1.7(e), until the holder of such Certificate shall surrender such
     Certificate. Subject to the effect of applicable laws, following surrender
     of any such Certificate, there shall be paid to the holder of the
     certificates representing whole shares of Company Common Stock issued in
     exchange therefor, without interest, (i) promptly, the amount of any cash
     payable with respect to a fractional share of Company Common Stock to which
     such holder is entitled pursuant to Section 1.7(e) and the amount of
     dividends or other distributions with a record date after the Effective
     Time theretofore paid with respect to such whole shares of Company Common
     Stock, and (ii) at the appropriate payment date, the amount of dividends or
     other distributions, with a record date after the Effective Time but prior
     to surrender and a payment date occurring after surrender, payable with
     respect to such whole shares of Company Common Stock.
 
          (d) No Further Rights in the Shares. All shares of Company Common
     Stock issued upon conversion of the Shares in accordance with the terms
     hereof (including any cash paid pursuant to Section 1.7(e)) shall be deemed
     to have been issued in full satisfaction of all rights pertaining to such
     Shares, including each Seller Right (as defined in Section 2.3).
 
          (e) No Fractional Shares. No certificates or scrip representing
     fractional shares of Company Common Stock shall be issued upon the
     surrender for exchange of Certificates, and such fractional share interest
     will not entitle the owner thereof to vote or to any rights of a
     shareholder of the Company. Each holder of a fractional share interest
     shall be paid an amount in cash equal to the product obtained by
     multiplying such fractional share interest to which such holder (after
     taking into account all fractional share interests then held by such
     holder) would otherwise be entitled by the average closing price for a
     share of Company Common Stock as quoted by the National Association of
     Securities Dealers Automated Quotation/National Market System
     ("NASDAQ/NMS") on the five business days immediately preceding the
     Effective Time. As soon as reasonably practicable after the determination
     of the amount of cash, if any, to be paid to holders of fractional share
     interests, the Company shall make available such amounts (without interest)
     to such holders of such fractional share interests.
 
          (f) Termination of Exchange Fund. Any portion of the Exchange Fund
     which remains undistributed to the former shareholders of Seller for six
     months after the Effective Time shall be delivered to the Company, upon
     demand, and any former shareholders of Seller who have not theretofore
     complied with this Article I shall thereafter look only to the Company to
     claim their shares of Company Common Stock, any cash in lieu of fractional
     shares of Company Common Stock and any dividends or distributions with
     respect to Company Common Stock, in each case without interest thereon, and
     subject to Section 1.7(g).
 
          (g) No Liability. Neither the Company nor the Seller shall be liable
     to any former holder of Shares for any such Shares (or dividends or
     distributions with respect thereto) or cash or other payment delivered to a
     public official pursuant to any abandoned property, escheat or similar
     laws.
 
                                       A-3
<PAGE>   86
 
          (h) Withholding Rights. The Company shall be entitled to deduct and
     withhold from the consideration otherwise payable pursuant to this
     Agreement to any former holder of Shares such amounts as the Company is
     required to deduct and withhold with respect to the making of such payment
     under the Code, or any provision of state, local or foreign tax law. To the
     extent that amounts are so withheld by the Company, such withheld amounts
     shall be treated for all purposes of this Agreement as having been paid to
     the former holder of the Shares in respect of which such deduction and
     withholding was made by the Company.
 
     SECTION 1.8 STOCK TRANSFER BOOKS. At the Effective Time, the stock transfer
books of Seller shall be closed and there shall be no further registration of
transfers of shares of Seller Common Stock thereafter on the records of Seller.
From and after the Effective Time, the holders of certificates evidencing
ownership of shares of Seller Common Stock outstanding immediately prior to the
Effective Time shall cease to have any rights with respect to such Shares except
as otherwise provided herein or by law. On or after the Effective Time, any
Certificates presented to the Exchange Agent or the Company for any reason shall
be replaced with a certificate representing shares of Company Common Stock in
accordance with this Article I.
 
     SECTION 1.9 ANTI-DILUTION PROVISIONS. In the event that between the date of
this Agreement and the Effective Time, the issued and outstanding shares of
Seller Common Stock or shares of Company Common Stock shall have been changed
into a different number of shares as a result of a stock split, reverse stock
split, stock dividend, recapitalization, reclassification or other similar
transaction, the Exchange Rate determined pursuant to Section 1.6(a) shall be
adjusted appropriately.
 
             ARTICLE II -- REPRESENTATIONS AND WARRANTIES OF SELLER
 
     Except as set forth in the Disclosure Schedule delivered by Seller to the
Company prior to the execution of this Agreement (the "Seller Disclosure
Schedule"), which shall identify exceptions by specific Section references,
Seller hereby represents and warrants to the Company that:
 
     SECTION 2.1 ORGANIZATION AND QUALIFICATION; SUBSIDIARIES.
 
          (a) Seller is a corporation duly organized, validly existing and in
     active status under the laws of the State of Wisconsin, and is a registered
     bank holding company under the Bank Holding Company Act of 1956, as amended
     (the "BHCA") and a registered Savings and Loan Holding Company under the
     Home Owners' Loan Act of 1933, as amended (the "HOLA"). Each subsidiary of
     Seller ("Seller Subsidiary" or, collectively, "Seller Subsidiaries") is a
     bank or a corporation duly organized, validly existing and in good standing
     under the laws of the state of its incorporation or the United States of
     America. Each of Seller and the Seller Subsidiaries has the requisite
     corporate power and authority and is in possession of all franchises,
     grants, authorizations, licenses, permits, easements, consents,
     certificates, approvals and orders ("Seller Approvals") necessary to own,
     lease and operate its properties and to carry on its business as it is now
     being conducted, including appropriate authorizations from the Federal
     Reserve Board, the Federal Deposit Insurance Corporation (the "FDIC"), the
     Wisconsin Commissioner of Banking (the "Wisconsin Commissioner"), the
     Office of the Comptroller of the Currency (the "OCC"), the Wisconsin
     Commissioner of Savings and Loan and the Federal Office of Thrift
     Supervision ("OTS"), except where the failure to be so organized, existing
     and in good standing or to have such power, authority and Seller Approvals
     would not, individually or in the aggregate, have a Material Adverse Effect
     (as defined below) on Seller and the Seller Subsidiaries, taken as a whole,
     and neither Seller nor any Seller Subsidiary has received any notice of
     proceedings relating to the revocation or modification of any Seller
     Approvals.
 
          (b) Seller and each Seller Subsidiary is duly qualified or licensed as
     a foreign corporation to do business, and is in good standing (or the
     equivalent thereof), in each jurisdiction where the character of its
     properties owned, leased or operated by it or the nature of its activities
     makes such qualification or licensing necessary, except for such failures
     to be so duly qualified or licensed and in good standing that would not,
     either individually or in the aggregate, have a Material Adverse Effect on
     Seller and the Seller Subsidiaries, taken as a whole.
 
                                       A-4
<PAGE>   87
 
          (c) A true and complete list of all of the Seller Subsidiaries,
     together with (i) the Seller's direct or indirect percentage ownership of
     each Seller Subsidiary, (ii) the jurisdiction in which the Seller
     Subsidiary is incorporated and (iii) a description of the principal
     business activities conducted by each Seller Subsidiary is set forth on
     Annex B. Each Seller Subsidiary has all regulatory approvals and authority
     necessary to engage in the business activities presently conducted by it.
     Except as set forth on Annex B, Seller and/or one or more of the Seller
     Subsidiaries owns beneficially and of record all of the outstanding shares
     of capital stock of each of the Seller Subsidiaries. Except for the
     subsidiaries set forth on Annex B, Seller does not directly or indirectly
     own any equity or similar interests in, or any interests convertible into
     or exchangeable or exercisable for any equity or similar interest in, any
     corporation, partnership, joint venture or other business association or
     entity other than in the ordinary course of business, and in no event in
     excess of 5% of the outstanding equity securities of such entity.
 
          (d) The term "Material Adverse Effect" as used in this Agreement shall
     mean any change or effect that is or is reasonably likely to be materially
     adverse to a party's business, operations, properties (including intangible
     properties), condition (financial or otherwise), assets or liabilities
     (including contingent liabilities).
 
     SECTION 2.2 ARTICLES OF INCORPORATION AND BY-LAWS. Seller has heretofore
furnished to the Company a complete and correct copy of the Articles of
Incorporation and the By-Laws, as amended or restated, of Seller ("Seller
Articles" or "Seller By-Laws"), each Seller Subsidiary which either is an
insured depository institution with total assets in excess of $400 million or is
any of Valley Trust Company, Valley Securities, Inc., Valley BankService
Corporation and Valley Real Estate Services Corporation (such Seller
Subsidiaries being referred to herein collectively as the "Significant Seller
Subsidiaries" and individually as a or the "Significant Seller Subsidiary").
Such Articles of Incorporation and By-Laws of Seller and each Seller Subsidiary
are in full force and effect. Neither Seller nor any Seller Subsidiary is in
violation of any of the provisions of its Articles of Incorporation or By-Laws.
 
     SECTION 2.3 CAPITALIZATION. The authorized capital stock of Seller consists
of 40,000,000 shares of Seller Common Stock and 1,000,000 shares of cumulative
preferred stock, par value $1.00 per share ("Seller Preferred Stock"), of which
200,000 shares of Seller Preferred Stock have been designated as Series A
Preferred Stock ("Seller Series A Preferred Stock"). As of the date of this
Agreement, (i) 20,330,632 shares of Seller Common Stock are issued and
outstanding, all of which are duly authorized, validly issued, fully paid and
non-assessable, except as otherwise provided by Section 180.0622(2)(b) of the
WBCL (such section, including judicial interpretations thereof and of Section
180.40(6), its predecessor statute, are referred to herein as "Section
180.0622(2)(b) of the WBCL"), and not issued in violation of any preemptive
right of any Seller shareholder; attached to each share of Seller Common Stock
outstanding is two-thirds of a right (a "Seller Right") to purchase Seller
Series A Preferred Stock pursuant to the terms of the Rights Agreement, dated as
of October 21, 1988, between Seller and The First National Bank of Boston, as
Rights Agent, as amended (the "Seller Rights Agreement"), (ii) no shares of
Seller Common Stock are held in the treasury of Seller, (iii) 1,290,110 shares
of Seller Common Stock are subject to issuance pursuant to outstanding employee
stock options issued pursuant to Seller's stock option plans, and (iv) 4,045,795
shares of Seller Common Stock are reserved for future issuance pursuant to the
Stock Option Agreement. As of the date of this Agreement, no shares of Seller
Preferred Stock are issued and outstanding. Except as set forth in clauses (iii)
and (iv), above, as of the date of this Agreement, there are no options,
warrants or other rights, agreements, arrangements or commitments of any
character, including without limitation voting agreements or arrangements,
relating to the issued or unissued capital stock of Seller or any Seller
Subsidiary or obligating Seller or any Seller Subsidiary to issue or sell any
shares of capital stock of, or other equity interests in, Seller or any Seller
Subsidiary. All shares of Seller Common Stock subject to issuance as aforesaid,
upon issuance on the terms and conditions specified in the instruments pursuant
to which they are issuable, shall be duly authorized, validly issued, fully paid
and non-assessable, except as otherwise provided by Section 180.0622(2)(b) of
the WBCL, and shall not be issued in violation of any preemptive right of any
Seller Shareholder. Except as described in the Seller Disclosure Schedule, there
are no obligations, contingent or otherwise, of Seller or any Seller Subsidiary
to repurchase, redeem or otherwise acquire any shares of Seller Common Stock or
the capital stock of any Seller Subsidiary or to provide funds to or make any
investment (in
 
                                       A-5
<PAGE>   88
 
the form of a loan, capital contribution or otherwise) in any Seller Subsidiary
or any other entity. Each of the outstanding shares of capital stock of each
Seller Subsidiary are duly authorized, validly issued, fully paid and
non-assessable, except as provided by Section 180.0622(2)(b) of the WBCL and
where applicable, in the case of Wisconsin state banks, Section 220.07 of the
Wisconsin Statutes, and, in the case of national banks, Title 12, Section 55 of
the United States Code, and not in violation of any preemptive rights of any
Seller Subsidiary shareholder, and such shares owned by Seller or another Seller
Subsidiary are owned free and clear of all security interests, liens, claims,
pledges, agreements, limitations of Seller's voting rights, charges or other
encumbrances of any nature whatsoever.
 
     SECTION 2.4 AUTHORITY. Seller has the requisite corporate power and
corporate authority to execute and deliver this Agreement and the Stock Option
Agreement, to perform its obligations hereunder and thereunder and to consummate
the transactions contemplated hereby and thereby (subject to the approval and
adoption of this Agreement by Seller's shareholders in accordance with the WBCL
and the Seller Articles and Seller By-Laws). The execution and delivery of this
Agreement and the Stock Option Agreement by Seller and the consummation by
Seller of the transactions contemplated hereby and thereby have been duly and
validly authorized by all necessary corporate action and no other corporate
proceedings on the part of Seller are necessary to authorize this Agreement or
the Stock Option Agreement or to consummate the transactions so contemplated
hereby and thereby (subject to the approval and adoption of this Agreement by
Seller's shareholders in accordance with the WBCL and the Seller Articles and
Seller By-Laws). This Agreement and the Stock Option Agreement have been duly
executed and delivered by Seller and, assuming the due authorization, execution
and delivery hereof by the Company, constitute valid and binding obligations of
Seller, enforceable against Seller in accordance with their respective terms,
except as the enforcement thereof may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium or similar laws generally affecting the
rights of creditors and subject to general equity principles.
 
     SECTION 2.5 NO CONFLICT; REQUIRED FILINGS AND CONSENTS.
 
          (a) The execution and delivery of this Agreement and the Stock Option
     Agreement by Seller do not, and the performance of this Agreement and the
     Stock Option Agreement and the transactions contemplated hereby and thereby
     by Seller shall not, (i) conflict with or violate the Seller Articles or
     Seller By-Laws or the Articles of Incorporation or By-Laws of any Seller
     Subsidiary, (ii) conflict with or violate any domestic (federal, state or
     local) or foreign law, statute, ordinance, rule, regulation, order,
     judgment or decree (collectively, "Laws") applicable to Seller or any
     Seller Subsidiary or by which its or any of their respective properties is
     bound or affected, or (iii) result in any breach of or constitute a default
     (or an event that with notice or lapse of time or both would become a
     default) under, or give to others any rights of termination, amendment,
     acceleration or cancellation of, or result in the creation of a lien or
     encumbrance on any of the properties or assets of Seller or any Seller
     Subsidiary pursuant to, any note, bond, mortgage, indenture, contract,
     agreement, lease, license, permit, franchise or other instrument or
     obligation to which Seller or any Seller Subsidiary is a party or by which
     Seller or any Seller Subsidiary or its or any of their respective
     properties is bound or affected, except for any such breaches, defaults or
     other occurrences that would not, individually or in the aggregate, have a
     Material Adverse Effect on Seller and the Seller Subsidiaries, taken as a
     whole. Section 2.5(a) of the Seller Disclosure Schedule sets forth any
     material note, bond, mortgage, indenture, contract, agreement, lease,
     license, permit, franchise or other instrument or obligation to which
     Seller or any Seller Subsidiary is a party or by which Seller or any Seller
     Subsidiary is bound or affected which would, as a result of the execution
     and delivery of this Agreement and the Stock Option Agreement or the
     transactions contemplated hereby and thereby, result in any breach of or
     constitute a default (or an event that with notice or lapse of time or both
     would become a default) under, or give to others any right of termination,
     amendment, acceleration or cancellation of, or result in the creation of a
     lien or encumbrance on any of the assets of the Seller or any Seller
     Subsidiary, such note, bond, mortgage, indenture, contract, agreement,
     lease, license or other instrument or obligation. The Board of Directors of
     Seller has approved the transactions contemplated herein and in the Stock
     Option Agreement, and such approval is all action necessary to ensure that
     the restrictions set forth in Sections 180.1140-44 and 180.1150 of the WBCL
     do not or will not apply to the transactions contemplated herein or in the
     Stock Option Agreement. The Seller Rights Agreement has
 
                                       A-6
<PAGE>   89
 
     been or will be amended to clarify that neither the Company nor any
     affiliate of the Company controlled by the Company shall become an
     "Acquiring Person" and no "Shares Acquisition Date" or "Distribution Date"
     (as such terms are defined in the Seller Rights Agreement) will occur as a
     result of the approval, execution or delivery of this Agreement or the
     Stock Option Agreement or the consummation of the transactions contemplated
     herein or therein.
 
          (b) The execution and delivery of this Agreement and the Stock Option
     Agreement by Seller do not, and the performance of this Agreement and the
     Stock Option Agreement by Seller shall not, require any consent, approval,
     authorization or permit of, or filing with or notification to, any
     governmental or regulatory authority, domestic or foreign, except (i) for
     applicable requirements, if any, of the Securities Act of 1933, as amended
     (the "Securities Act"), the Securities Exchange Act of 1934, as amended
     (the "Exchange Act"), state securities or blue sky laws ("Blue Sky Laws"),
     the BHCA, the banking laws of the State of Wisconsin (the "WBL"), the HOLA,
     the filing and recordation of appropriate merger or other documents as
     required by the WBCL, and the listing on the NASDAQ/NMS of the shares of
     Seller Common Stock issuable upon exercise of the option granted under the
     Stock Option Agreement and (ii) where the failure to obtain such consents,
     approvals, authorizations or permits, or to make such filings or
     notifications, would not prevent or delay consummation of the Merger or
     issuance of Seller Common Stock pursuant to the Stock Option Agreement, or
     otherwise prevent Seller from performing its obligations under this
     Agreement or the Stock Option Agreement, and would not have a Material
     Adverse Effect on Seller and the Seller Subsidiaries, taken as a whole.
 
     SECTION 2.6 COMPLIANCE; PERMITS. Except as disclosed in the Seller
Disclosure Schedule, neither Seller nor any Seller Subsidiary is in conflict
with, or in default or violation of, (i) any Law applicable to Seller or any
Seller Subsidiary or by which its or any of their respective properties is bound
or affected, or (ii) any note, bond, mortgage, indenture, contract, agreement,
lease, license, permit, franchise or other instrument or obligation to which
Seller or any Seller Subsidiary is a party or by which Seller or any Seller
Subsidiary or its or any of their respective properties is bound or affected,
except for any such conflicts, defaults or violations which would not,
individually or in the aggregate, have a Material Adverse Effect on Seller and
the Seller Subsidiaries, taken as a whole.
 
     SECTION 2.7 SECURITIES AND BANKING REPORTS; FINANCIAL STATEMENTS.
 
          (a) Seller has filed all forms, reports and documents required to be
     filed with the Securities and Exchange Commission (the "SEC") since
     December 31, 1990, and as of the date of this Agreement has delivered to
     the Company, in the form filed with the SEC, (i) its Annual Reports on Form
     10-K for the fiscal years ended December 31, 1990, 1991 and 1992,
     respectively, (ii) its Quarterly Reports on Form 10-Q for the periods ended
     March 31, 1993 and June 30, 1993, (iii) all proxy statements relating to
     Seller's meetings of shareholders (whether annual or special) held since
     December 31, 1990, (iv) all Reports on Form 8-K filed by Seller with the
     SEC since December 31, 1990, (v) all other reports or registration
     statements (other than Reports on Form 10-Q not referred to in clause (ii)
     above, since December 31, 1990) and (vi) all amendments and supplements to
     all such reports and registration statements filed by Seller with the SEC
     since December 31, 1990 (collectively, the "Seller SEC Reports").
 
          (b) Seller and each Seller Subsidiary have filed all forms, reports
     and documents required to be filed with the Federal Reserve Board, the
     Wisconsin Commissioner and any other applicable federal or state securities
     or banking authorities (all such reports and statements are collectively
     referred to with the Seller SEC Reports as the "Seller Reports"). The
     Seller Reports, including all Seller Reports filed after the date of this
     Agreement, (i) were or will be prepared in accordance with the requirements
     of applicable Law in all material respects and (ii) did not at the time
     they were filed, or will not at the time they are filed, contain any untrue
     statement of a material fact or omit to state a material fact required to
     be stated therein or necessary in order to make the statements therein, in
     the light of the circumstances under which they were made, not misleading.
 
          (c) Each of the consolidated financial statements (including, in each
     case, any related notes thereto) contained in the Seller SEC Reports,
     including any Seller SEC Reports filed since the date of
 
                                       A-7
<PAGE>   90
 
     this Agreement and prior to or on the Effective Time, have been or will be
     prepared in accordance with generally accepted accounting principles
     applied on a consistent basis throughout the periods involved (except as
     may be indicated in the notes thereto) and each fairly presents the
     consolidated financial position of Seller and Seller Subsidiaries as of the
     respective dates thereof and the consolidated results of its operations and
     changes in financial position for the periods indicated, except that any
     unaudited interim financial statements were or will be subject to normal
     and recurring year-end adjustments which were not or are not expected to be
     material in amount.
 
          (d) Except as and to the extent set forth on the consolidated balance
     sheet of Seller and Seller Subsidiaries as of December 31, 1992, including
     all notes thereto (the "Seller Balance Sheet"), neither Seller nor any
     Seller Subsidiary has any liabilities or obligations of any nature (whether
     accrued, absolute, contingent or otherwise) that would be required to be
     reflected on a balance sheet, or in the notes thereto, prepared in
     accordance with generally accepted accounting principles, except (i) for
     liabilities or obligations incurred in the ordinary course of business
     since December 31, 1992 that would not, individually or in the aggregate,
     have a Material Adverse Effect on Seller and the Seller Subsidiaries, taken
     as a whole, or (ii) as otherwise reflected in the quarterly reports
     referred to in clause (ii) of Section 2.7(a) hereof. Except as disclosed in
     the Seller Disclosure Schedule, neither the Seller nor any Seller
     Subsidiary has any liabilities or obligations of any nature (whether
     accrued, absolute, contingent or otherwise) that are not required to be
     reflected on a balance sheet, or in the notes thereto, except for
     liabilities or obligations that do not, individually or in the aggregate,
     have a Material Adverse Effect on Seller and the Seller Subsidiaries, taken
     as a whole.
 
          (e) Without limitation to the foregoing, Seller's consolidated
     allowance for loan losses is not less than 1.25% of total consolidated
     loans reflected on Seller's consolidated financial statements.
 
     SECTION 2.8 ABSENCE OF CERTAIN CHANGES OR EVENTS. Except as disclosed in
the Seller SEC Reports filed prior to the date of this Agreement, since December
31, 1992 to the date of this Agreement, Seller and the Seller Subsidiaries have
conducted their businesses only in the ordinary course and in a manner
consistent with past practice and, since December 31, 1992, there has not been
(i) any change in the financial condition, results of operations or business of
Seller or any of the Seller Subsidiaries having a Material Adverse Effect on
Seller and the Seller Subsidiaries, taken as a whole, (ii) any damage,
destruction or loss (whether or not covered by insurance) with respect to any
assets of Seller or any of the Seller Subsidiaries having a Material Adverse
Effect on Seller and the Seller Subsidiaries, taken as a whole, (iii) any change
by Seller in its accounting methods, principles or practices, (iv) any
revaluation by Seller of any of its assets in any material respect, (v) except
as disclosed on the Seller Disclosure Schedule, any entry by Seller or any of
the Seller Subsidiaries into any commitment or transactions material to Seller
and the Seller Subsidiaries, taken as a whole, (vi) except for regular quarterly
cash dividends of $.34 (for the first quarter of 1993) and $.24 (for the second
quarter of 1993) per share of Seller Common Stock with usual record and payment
dates, and the three-for-two stock split effected in the form of a 50% stock
dividend distributed on August 27, 1993, any declaration, setting aside or
payment of any dividends or distributions in respect of shares of Seller Common
Stock or any redemption, purchase or other acquisition of any of its securities
(except for the optional prepayment in whole on September 1, 1993 of Seller's
11.25% Senior Notes due August 1, 1995) or any of the securities of any Seller
Subsidiary or (vii) any increase in or establishment of any bonus, insurance,
severance, deferred compensation, pension, retirement, profit sharing, stock
option (including, without limitation, the granting of stock options, stock
appreciation rights, performance awards, or restricted stock awards), stock
purchase or other employee benefit plan, or any other increase in the
compensation payable or to become payable to any officers or employees of Seller
or any of its subsidiaries whose total compensation in 1992 exceeded $120,000,
or (viii) any increases generally to employees of Seller or any Seller
Subsidiary.
 
     SECTION 2.9 ABSENCE OF LITIGATION. Except as disclosed in the Seller
Reports filed prior to the date of this Agreement and in the Seller Disclosure
Schedule: (a) neither Seller nor any of the Seller Subsidiaries is subject to
any continuing order of, or written agreement or memorandum of understanding
with, or continuing material investigation by, any federal or state banking or
insurance authority or other governmental entity or authority, or any judgment,
order, writ, injunction, decree or award of any governmental entity or
arbitrator, including, without limitation, cease-and-desist or other orders of
any bank regulatory authority, (b) there is no
 
                                       A-8
<PAGE>   91
 
claim of any kind, action, suit, litigation, proceeding, arbitration,
investigation, or controversy affecting Seller or any Seller Subsidiary pending
or, to the best knowledge of Seller after due inquiry, threatened, and (c) there
are no uncured violations, or violations with respect to which refunds or
restitutions may be required, cited in any compliance report to Seller or any
Seller Subsidiary as a result of the examination by any bank regulatory
authority, except for matters described in clauses (a), (b) and (c) which,
individually or in the aggregate, will not have a Material Adverse Effect on the
Seller and the Seller Subsidiaries taken as a whole.
 
     SECTION 2.10 EMPLOYEE BENEFIT PLANS.
 
          (a) Section 2.10(a) of the Seller Disclosure Schedule lists (i) all
     employee benefit plans (as defined in Section 3(3) of the Employee
     Retirement Income Security Act of 1974, as amended ("ERISA")), and all
     bonus, stock option, stock purchase, restricted stock, incentive, deferred
     compensation, retiree medical or life insurance, supplemental retirement,
     severance or other benefit plans, programs or arrangements, and all
     material employment, termination, severance or other employment contracts
     or employment agreements, with respect to which Seller or any Seller
     Subsidiary has any obligation (collectively, the "Plans"). Seller has
     furnished or made available to the Company a complete and accurate copy of
     each Plan (or a description of the Plans, if the Plans are not in writing)
     and a complete and accurate copy of each material document prepared in
     connection with each such Plan, including, without limitation and where
     applicable, a copy of (i) each trust or other funding arrangement, (ii)
     each summary plan description and summary of material modifications, (iii)
     the most recently filed IRS Form 5500 and related schedules, (iv) the most
     recently issued IRS determination letter for each such Plan and (v) the
     most recently prepared actuarial report and financial statement in
     connection with each such Plan.
 
          (b) Absence of Certain Types of Plans. No member of Seller's
     "controlled group," within the meaning of Section 4001(a)(14) of ERISA,
     maintains or contributes to, or within the five years preceding the
     Effective Time has maintained or contributed to, an employee pension
     benefit plan subject to Title IV of ERISA. Except as disclosed in the
     Seller Disclosure Schedule, none of the Plans obligates Seller or any of
     the Seller Subsidiaries to pay material separation, severance, termination
     or similar-type benefits solely as a result of any transaction contemplated
     by this Agreement or as a result of a "change in control," within the
     meaning of such term under Section 280G of the Code. Except as disclosed in
     the Seller Disclosure Schedule, or as required by COBRA, none of the Plans
     provides for or promises retiree medical, disability or life insurance
     benefits to any current or former employee, officer or director of Seller
     or any of the Seller Subsidiaries. Each of the Plans is subject only to the
     laws of the United States or a political subdivision thereof.
 
          (c) Compliance with Applicable Law. Except as disclosed in the Seller
     Disclosure Schedule, each Plan has been operated in all respects in
     accordance with the requirements of all applicable Law and all persons who
     participate in the operation of such Plans and all Plan "fiduciaries"
     (within the meaning of Section 3(21) of ERISA) have acted in accordance
     with the provisions of all applicable Law, except where such violations of
     applicable Law would not, individually or in the aggregate, have a Material
     Adverse Effect on Seller and the Seller Subsidiaries, taken as a whole.
     Seller and the Seller Subsidiaries have performed all obligations required
     to be performed by any of them under, are not in any respect in default
     under or in violation of, and Seller has no knowledge of any default or
     violation by any party to, any Plan, except where such failures, defaults
     or violations would not, individually or in the aggregate, have a Material
     Adverse Effect on Seller and the Seller Subsidiaries, taken as a whole. No
     legal action, suit or claim is pending or, to the knowledge of Seller,
     threatened with respect to any Plan (other than claims for benefits in the
     ordinary course) and, except as disclosed in the Seller Disclosure
     Schedule, to the knowledge of Seller, no fact or event exists that could
     give rise to any such action, suit or claim. Except as disclosed in the
     Seller Disclosure Schedule, neither Seller nor any Seller Subsidiary has
     incurred any material liability to the Pension Benefit Guaranty Corporation
     or any material "withdrawal liability" within the meaning of Section 420 of
     ERISA.
 
          (d) Qualification of Certain Plans. Each Plan that is intended to be
     qualified under Section 401(a) of the Code or Section 401(k) of the Code
     has received a favorable determination letter
 
                                       A-9
<PAGE>   92
 
     from the IRS (as defined herein) that it is so qualified, and each trust
     established in connection with any Plan that is intended to be exempt from
     federal income taxation under Section 501(a) of the Code is so exempt, and,
     except as disclosed in the Seller Disclosure Schedule, no fact or event has
     occurred since the date of such determination letter from the IRS to
     adversely affect the qualified status of any such Plan or the exempt status
     of any such trust. Except as disclosed on the Seller Disclosure Schedule,
     no trust maintained or contributed to by Seller or any of the Seller
     Subsidiaries is intended to be qualified as a voluntary employees'
     beneficiary association or is intended to be exempt from federal income
     taxation under Section 501(c)(9) of the Code.
 
          (e) Absence of Certain Liabilities and Events. Except for matters
     disclosed in the Seller Disclosure Schedule, there has been no prohibited
     transaction (within the meaning of Section 406 of ERISA or Section 4975 of
     the Code) with respect to any Plan. Seller and each of the Seller
     Subsidiaries has not incurred any liability for any excise tax arising
     under Section 4972 or 4980B of the Code and to the knowledge of Seller no
     fact or event exists that could give rise to any such liability.
 
          (f) Plan Contributions. All contributions, premiums or payments
     required to be made with respect to any Plan have been made on or before
     their due dates.
 
          (g) Stock Options. Section 2.10(g) of the Seller Disclosure Schedule
     sets forth a true and complete list of each current or former employee,
     officer or director of Seller or any Seller Subsidiary who holds any option
     to purchase Seller Common Stock as of the date of this Agreement, together
     with the number of shares of Seller Common Stock subject to such option,
     the date of grant of such option, the option price of such option, whether
     such option is intended to qualify as an incentive stock option within the
     meaning of Section 422(b) of the Code (an "ISO"), and the expiration date
     of such option. Section 2.10(g) of the Seller Disclosure Schedule also sets
     forth the total number of such ISOs and such non-qualified options.
 
          (h) Employment Contracts. Except for employment, severance, consulting
     or other similar contracts with any employees, consultants, officers or
     directors of Seller or any of the Seller Subsidiaries disclosed in Section
     2.10(h) of the Seller Disclosure Schedule, neither Seller nor any Seller
     Subsidiary is a party to any such contracts. Neither Seller nor any Seller
     Subsidiary is a party to any collective bargaining agreements.
 
     SECTION 2.11 REGISTRATION STATEMENT; JOINT PROXY STATEMENT. The information
supplied by Seller for inclusion in the Registration Statement (as defined in
Section 3.11) shall not at the time the Registration Statement is declared
effective contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading. The information supplied by Seller for inclusion in the
joint proxy statement to be sent to the shareholders of Seller in connection
with the meeting of Seller's shareholders to consider the Merger (the "Seller
Shareholders Meeting") and to be sent to the shareholders of the Company to
consider the Merger (the "Company Shareholders Meeting") (such proxy statement
as amended or supplemented is referred to herein as the "Joint Proxy Statement")
shall not, at the date the Joint Proxy Statement (or any amendment thereof or
supplement thereto) is first mailed to shareholders, at the time of the Seller
Shareholders Meeting, at the time of the Company Shareholders Meeting and at the
Effective Time, be false or misleading with respect to any material fact
required to be stated therein, or omit to state any material fact required to be
stated therein or necessary in order to make the statements made therein, in the
light of the circumstances under which they are made, not misleading; or omit to
state any material fact necessary to correct any statement in any earlier
communication with respect to the solicitation of proxies for the Seller
Shareholders Meeting or the Company Shareholders Meeting which has become false
or misleading. If at any time prior to the Effective Time any event relating to
Seller or any of its affiliates, officers or directors should be discovered by
Seller which should be set forth in an amendment to the Registration Statement
or a supplement to the Joint Proxy Statement, Seller shall promptly inform the
Company. The Joint Proxy Statement shall comply in all material respects as to
form and substance with the requirements of the Exchange Act and the rules and
regulations thereunder. Notwithstanding the foregoing, Seller makes no
 
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<PAGE>   93
 
representation or warranty with respect to any information about, or supplied or
omitted by, the Company which is contained in any of the foregoing documents.
 
     SECTION 2.12 TITLE TO PROPERTY. Seller and each of the Seller Subsidiaries
has good and marketable title to all of their respective properties and assets,
real and personal, free and clear of all mortgage liens, and free and clear of
all other liens, charges and encumbrances except liens for taxes not yet due and
payable, pledges to secure deposits and such minor imperfections of title, if
any, as do not, individually or in the aggregate, have a Material Adverse Effect
on Seller and the Seller Subsidiaries, taken as a whole; and all leases pursuant
to which Seller or any of the Seller Subsidiaries lease from others material
amounts of real or personal property are in good standing, valid and effective
in accordance with their respective terms, and there is not, under any of such
leases, any existing material default or event of default (or event which with
notice or lapse of time, or both, would constitute a material default and in
respect of which the Seller or such Seller Subsidiary has not taken adequate
steps to prevent such a default from occurring). Substantially all of Seller's
and each of the Seller's Subsidiaries' buildings and equipment in regular use
have been reasonably maintained and are in good and serviceable condition,
reasonable wear and tear excepted. Listed in Section 2.12 of the Seller
Disclosure Schedule are all currently planned acquisitions or dispositions of
capital assets, other than transactions in the ordinary course of business and
consistent with past practice and in no event with a value in excess of
$300,000.
 
     SECTION 2.13 ENVIRONMENTAL MATTERS.
 
          (a) Seller represents and warrants to the Company that, to the best of
     Seller's knowledge (which the Company acknowledges is based on no
     investigation by Seller other than that customarily undertaken by Seller in
     accordance with its policies) and except as disclosed in the Seller
     Disclosure Schedule: (i) Hazardous Materials (as defined below) have not
     been stored, released or disposed of on or from Seller's Property (as
     defined below) or, to the actual knowledge of Seller, any property
     adjoining Seller's Property; (ii) Environmental Permits (as defined below)
     have been obtained and are in effect for the operations conducted at
     Seller's Property; (iii) Seller and the Seller Subsidiaries are in
     compliance in all material respects with the requirements of all of their
     Environmental Permits; and (iv) there are no circumstances with respect to
     any Seller Property that could reasonably be anticipated (A) to form the
     basis of an Environmental Claim against Seller or the Seller Subsidiaries
     or Seller's Property that, individually or in the aggregate, could have a
     Material Adverse Effect on Seller and the Seller Subsidiaries, taken as a
     whole, or (B) to cause Seller's Property to be subject to any restrictions
     on ownership, occupancy, use or transferability under any applicable
     Environmental Law.
 
          (b) As used herein, the following terms shall be defined as follows:
 
             (i) "Seller's Property" means any real property and improvements
        currently owned, leased, used, operated or occupied by Seller or any
        Seller Subsidiary, including properties acquired by foreclosure or held
        or operated in a fiduciary or managerial capacity;
 
             (ii) "Hazardous Materials" means (A) any petroleum or petroleum
        products, radioactive materials, asbestos in any form that is or could
        become friable, urea formaldehyde foam insulation, transformers or other
        equipment that contain dielectric fluid containing levels of
        polychlorinated biphenyls and radon gas; (B) any chemicals, materials or
        substances defined as or included in the definition of "hazardous
        substances," or words of similar import, under any applicable
        Environmental Law; and (C) any other chemical, material or substance,
        exposure to which is prohibited, limited or regulated by any
        governmental authority;
 
             (iii) "Environmental Law" means any federal, state, local or
        foreign statute, law, rule, regulation, ordinance, code, policy or rule
        of common law in effect and in each case as amended as of the Effective
        Time, and any judicial or administrative interpretation thereof as of
        the Effective Time, including any judicial or administrative order,
        consent decree or judgment, relating to the environment, health, safety
        or Hazardous Materials;
 
                                      A-11
<PAGE>   94
 
             (iv) "Environmental Claims" means any and all administrative,
        regulatory or judicial actions, suits, demands, demand letters, claims,
        liens, notices of noncompliance or violation, investigations or
        proceedings relating in any way to any Environmental Law or
        Environmental Permit; and
 
             (v) "Environmental Permits" means all permits, approvals,
        identification numbers, licenses and other authorizations required under
        any applicable Environmental Law.
 
     SECTION 2.14 ABSENCE OF AGREEMENTS. Neither Seller nor any Seller
Subsidiary is a party to any agreement or memorandum of understanding with, or a
party to any commitment letter or similar undertaking to, or is subject to any
order or directive by, or is a recipient of any extraordinary supervisory letter
which restricts materially the conduct of its business (including any contract
containing covenants which limit the ability of Seller or any Seller Subsidiary
to compete in any line of business or with any person or which involve any
restriction of the geographical area in which, or method by which, Seller or any
Seller Subsidiary may carry on its business (other than as may be required by
Law or applicable regulatory authorities)), or in any manner relates to its
capital adequacy, its credit policies or its management, except for those the
existence of which has been disclosed to the Company prior to the date of this
Agreement, nor has Seller been advised that any federal, state, or governmental
agency is contemplating issuing or requesting (or is considering the
appropriateness of issuing or requesting) any such order, decree, agreement,
memorandum of understanding, extraordinary supervisory letter, commitment letter
or similar submission, except as disclosed by Seller in Section 2.14 of the
Seller Disclosure Schedule.
 
     SECTION 2.15 TAXES. Seller and the Seller Subsidiaries have filed all Tax
Returns (as defined below) required to be filed by them, and Seller and the
Seller Subsidiaries have timely paid and discharged all Taxes (as defined below)
due in connection with or with respect to the filing of such Tax Returns and
have paid all other Taxes as are due, except such as are being contested in good
faith by appropriate proceedings and/or with respect to which Seller is
maintaining reserves adequate for their payment. To the best of the knowledge of
Seller, the liability for Taxes set forth on each such Tax Return adequately
reflects the Taxes required to be reflected on such Tax Return. For purposes of
this Agreement, "Tax" or "Taxes" shall mean taxes, charges, fees, levies, and
other governmental assessments and impositions of any kind, payable to any
federal, state, local or foreign governmental entity or taxing authority or
agency, including, without limitation, (i) income, franchise, profits, gross
receipts, estimated, ad valorem, value added, sales, use, service, real or
personal property, capital stock, license, payroll, withholding, disability,
employment, social security, workers compensation, unemployment compensation,
utility, severance, production, excise, stamp, occupation, premiums, windfall
profits, transfer and gains taxes, (ii) customs duties, imposts, charges, levies
or other similar assessments of any kind, and (iii) interest, penalties and
additions to tax imposed with respect thereto; and "Tax Returns" shall mean
returns, reports, and information statements with respect to Taxes required to
be filed with the United States Internal Revenue Service (the "IRS") or any
other governmental entity or taxing authority or agency, domestic or foreign,
including, without limitation, consolidated, combined and unitary tax returns.
For the purposes of this Section 2.15, references to Seller and the Seller
Subsidiaries include former subsidiaries of Seller for the periods during which
any such corporations were owned, directly or indirectly, by Seller. Except as
disclosed in the Seller Disclosure Schedule, neither the IRS nor any other
governmental entity or taxing authority or agency is now asserting, either
through audits, administrative proceedings, court proceedings or otherwise, or,
to the best of Seller's knowledge, threatening to assert against Seller or any
of the Seller Subsidiaries any deficiency or claim for additional Taxes. There
are no tax liens on any assets of Seller or any of the Seller Subsidiaries.
Neither Seller nor any of the Seller Subsidiaries has received a ruling or
entered into an agreement with the IRS or any other governmental entity or
taxing authority or agency that would have a Material Adverse Effect on Seller
and the Seller Subsidiaries, taken as a whole, after the Effective Time. The
accruals and reserves for Taxes reflected in the Seller Balance Sheet are
adequate to cover all Taxes accruable through the date thereof (including Taxes
being contested) in accordance with generally accepted accounting principles.
Except for Seller's and the Seller Subsidiaries' intercompany tax allocation
agreements, no agreements relating to allocating or sharing of Taxes exist among
Seller and the Seller Subsidiaries and no tax indemnities given by Seller or the
Seller Subsidiaries in connection with a sale of stock or assets remain in
effect. Neither Seller nor any of the Seller Subsidiaries is required to include
in income either (i) any material amount in respect of any adjustment under
Section 481 of the Code, or (ii) any
 
                                      A-12
<PAGE>   95
 
material installment sale gain. Neither Seller nor any of the Seller
Subsidiaries has made an election under Section 341(f) of the Code.
 
     SECTION 2.16 INSURANCE. Seller has made available to the Company correct
and complete copies of all material policies of insurance of Seller and the
Seller Subsidiaries currently in effect. Neither Seller nor any of the Seller
Subsidiaries has any liability for unpaid premiums or premium adjustments not
properly reflected on Seller's financial statements included in Seller's Report
on Form 10-Q for the quarter ended June 30, 1993, except for those first
becoming due after such date.
 
     SECTION 2.17 BROKERS. No broker, finder or investment banker (other than
Keefe, Bruyette & Woods, Inc.) is entitled to any brokerage, finder's or other
fee or commission in connection with the transactions contemplated by this
Agreement based upon arrangements made by or on behalf of Seller. Prior to the
date of this Agreement, Seller has furnished to the Company a complete and
correct copy of all agreements between Seller and Keefe Bruyette & Woods, Inc.
pursuant to which such firm would be entitled to any payment relating to the
transactions contemplated hereunder.
 
     SECTION 2.18 ACCOUNTING AND TAX MATTERS.
 
          (a) Neither Seller nor, to the best of Seller's knowledge, any of its
     affiliates has through the date of this Agreement taken or agreed to take
     any action that would prevent the Company from accounting for the business
     combination to be effected by the Merger as a pooling of interests or would
     prevent the Merger from qualifying as a reorganization under Section
     368(a)(1)(A) of the Code.
 
          (b) To Seller's knowledge, there is no plan or intention on the part
     of shareholders of Seller who will receive Company Common Stock to sell or
     otherwise dispose of an amount of Company Common Stock to be received in
     the Merger which would reduce their ownership of Company Common Stock to a
     number of shares having in the aggregate a value at the time of the Merger
     of less than 50 percent of the total value of the Seller Common Stock
     outstanding immediately prior to the Merger.
 
     SECTION 2.19 MATERIAL ADVERSE EFFECT.
 
          (a) Since December 31, 1992, there has been no Material Adverse Effect
     on Seller and the Seller Subsidiaries, taken as a whole.
 
          (b) The consolidated book value of Seller is not less than the
     consolidated book value of Seller as reflected on Seller's consolidated
     financial statements included in Seller's Form 10-Q for the quarter ended
     June 30, 1993.
 
     SECTION 2.20 MATERIAL CONTRACTS. Except as disclosed in the Seller
Disclosure Schedule (which may reference other sections of such Schedule) and,
with respect to (ii), below, except as included as exhibits in the Seller SEC
Reports, neither the Seller nor any Seller Subsidiary is a party to or obligated
under any contract, agreement or other instrument or understanding which (i) is
not terminable by Seller or the Seller Subsidiary without additional payment or
penalty within 60 days and obligates Seller or any Seller Subsidiary for
payments or other consideration with a value in excess of $300,000 or (ii) would
require disclosure by Seller pursuant to item 601(b)(10) of Regulation S-K under
the Exchange Act.
 
     SECTION 2.21 FULL DISCLOSURE. No statement contained in any document,
certificate, or other writing furnished or to be furnished by Seller to the
Company in, or pursuant to the provisions of, this Agreement contains or shall
contain any untrue statement of a material fact or omits or shall omit to state
any material fact necessary, in light of the circumstances under which it was
made, in order to make the statements herein or therein not misleading.
 
     SECTION 2.22 OPINION OF FINANCIAL ADVISOR. Seller has received the oral
opinion of Keefe, Bruyette & Woods, Inc. on the date of this Agreement to the
effect that, as of the date of this Agreement, the consideration to be received
in the Merger by Seller's shareholders is fair to Seller's shareholders from a
financial point of view, and Seller will promptly deliver a written copy of such
opinion to the Company when made available to Seller.
 
                                      A-13
<PAGE>   96
 
     SECTION 2.23 VOTE REQUIRED. Unless the Company takes any action that would
require a greater vote, the affirmative vote of a majority of the votes that
holders of the outstanding shares of Seller Common Stock are entitled to cast is
the only vote of the holders of any class or series of Seller capital stock
necessary to approve the Merger.
 
          ARTICLE III -- REPRESENTATIONS AND WARRANTIES OF THE COMPANY
 
     Except as set forth in the Disclosure Schedule delivered by the Company to
Seller prior to the execution of this Agreement (the "Company Disclosure
Schedule"), which shall identify exceptions by specific Section references, the
Company hereby represents and warrants to Seller that:
 
     SECTION 3.1 ORGANIZATION AND QUALIFICATION; SUBSIDIARIES.
 
          (a) The Company is a corporation duly organized, validly existing and
     in active status under the laws of the State of Wisconsin and a registered
     bank holding company under the BHCA, and will, prior to or simultaneous
     with the Effective Time, become a registered savings and loan holding
     company under the HOLA. Each subsidiary of the Company (a "Company
     Subsidiary" or, collectively, "Company Subsidiaries") is a bank or a
     corporation duly organized, validly existing and in good standing under the
     laws of the state of its incorporation or the United States of America.
     Each of the Company and the Company Subsidiaries have the requisite
     corporate power and authority and are in possession of all franchises,
     grants, authorizations, licenses, permits, easements, consents,
     certificates, approvals and orders ("Company Approvals") necessary to own,
     lease and operate their respective properties and to carry on their
     respective business as now being conducted, including appropriate
     authorizations from the Federal Reserve Board, the FDIC, the Wisconsin
     Commissioner or the OCC except where the failure to be so organized,
     existing and in good standing or to have such power, authority and Company
     Approvals would not, individually or in the aggregate, have a Material
     Adverse Effect on the Company and the Company Subsidiaries, taken as a
     whole, and neither the Company nor any Company Subsidiary has received any
     notice of proceedings relating to the revocation or modification of any
     Company Approvals.
 
          (b) The Company and each Company Subsidiary is duly qualified or
     licensed as a foreign corporation to do business, and is in good standing
     (or the equivalent thereof), in each jurisdiction where the character of
     its properties owned, leased or operated by it or the nature of its
     activities makes such qualification or licensing necessary, except for such
     failures to be so duly qualified or licensed and in good standing that
     would not, either individually or in the aggregate, have a Material Adverse
     Effect on the Company and the Company Subsidiaries, taken as a whole.
 
          (c) A true and complete list of all of the Company Subsidiaries is set
     forth in Exhibit 22 to the Company's Annual Report on Form 10-K for the
     year ended December 31, 1992 previously delivered to Seller. Except as set
     forth in the Company Disclosure Schedule, the Company and/or one or more of
     the Company Subsidiaries owns beneficially and of record all or
     substantially all of the outstanding shares of capital stock of each of the
     Company Subsidiaries. Except for the Company Subsidiaries, set forth on
     said Exhibit 22, the Company does not directly or indirectly own any equity
     or similar interests in, or any interests convertible into or exchangeable
     or exercisable for any equity or similar interest in, any corporation,
     partnership, joint venture or other business, other than in the ordinary
     course of business, and in no event in excess of 5% of the outstanding
     equity securities of such entity.
 
     SECTION 3.2 ARTICLES OF INCORPORATION AND BY-LAWS. The Company has
previously furnished to Seller a complete and correct copy of the Company
Articles and the Company By-Laws. The Company Articles and Company By-Laws are
in full force and effect. The Company is not in violation of any of the
provisions of the Company Articles or the Company By-Laws. The Company
represents that it will, prior to the Effective Time, amend the Company Articles
so as to increase the authorized Company Common Stock as necessary to permit it
to consummate the issuances contemplated by this Agreement (the "Company
Articles Amendment").
 
                                      A-14
<PAGE>   97
 
     SECTION 3.3 CAPITALIZATION.
 
          (a) The authorized capital stock of the Company consists of (i)
     80,000,000 shares of Company Common Stock of which, as of the date of this
     Agreement, 62,988,848 shares were issued and outstanding, 3,402,037 shares
     were held in treasury, 4,228,382 shares were reserved for issuance pursuant
     to outstanding employee stock options, 1,962,900 shares were reserved for
     issuance pursuant to the conversion of the Company Series A Preferred Stock
     (as defined below), 5,714,286 shares were reserved for issuance pursuant to
     8 1/2% Convertible Subordinated Notes due 1997 and 79,353 shares were
     reserved for issuance pursuant to 13% Convertible Notes due 1993; and (ii)
     5,000,000 shares of Preferred Stock, $1.00 par value ("Company Preferred
     Stock"), of which 500,000 shares of Company Preferred Stock have been
     designated as Series A Convertible Preferred Stock ("Company Series A
     Preferred Stock"), 185,314 of which, as of the date of this Agreement, are
     outstanding. All of the outstanding shares of the Company's capital stock
     have been duly authorized and validly issued and are fully paid and non-
     assessable, except pursuant to Section 180.0622(2)(b) of the WBCL, and not
     issued in violation of any preemptive right of any Company shareholder.
     Except as set forth in clauses (i)-(ii), above, as of the date of this
     Agreement there are no options, warrants or other rights, agreements,
     arrangements or commitments of any character, including without limitation,
     voting agreements or arrangements relating to the issued or unissued
     capital stock of the Company or any Company Subsidiary or obligating the
     Company or any Company Subsidiary to issue or sell any shares of capital
     stock of, or other equity interests in, the Company or any Company
     Subsidiary. Each of the outstanding shares of capital stock of each Company
     Subsidiary are duly authorized, validly issued, fully paid and
     nonassessable, except as provided by Section 180.0622(2)(b) of the WBCL
     where applicable and, in the case of Wisconsin state banks, Section 220.07
     of the Wisconsin Statutes, and, in the case of national banks, Title 12,
     Section 55 of the United States Code, and not in violation of preemptive
     rights of any Company Subsidiary shareholder, and such shares owned by the
     Company or another Company Subsidiary are owned free and clear of all
     security interests, liens, claims, pledges, agreements, limitations of
     Company's voting rights, charges or other encumbrances of any nature
     whatsoever.
 
          (b) The shares of Company Common Stock to be issued pursuant to the
     Merger will, upon issuance in accordance with the provisions of this
     Agreement, be duly authorized, validly issued, fully paid and
     non-assessable, except as otherwise provided by Section 180.0622(2)(b) of
     the WBCL, and not issued in violation of any preemptive right of any
     Company shareholder.
 
     SECTION 3.4 AUTHORITY. The Company has the requisite corporate power and
corporate authority to execute and deliver this Agreement and the Stock Option
Agreement, and to perform its obligations hereunder and thereunder and to
consummate the transactions contemplated hereby and thereby (subject to the
approval and adoption of this Agreement and the Company Articles Amendment by
the Company's shareholders in accordance with the WBCL and the Company Articles
and the Company By-Laws). The execution and delivery of this Agreement and the
Stock Option Agreement by the Company and the consummation by the Company of the
transactions contemplated hereby and thereby have been duly and validly
authorized by all necessary corporate action on the part of the Company, and no
other corporate proceedings on the part of the Company are necessary to
authorize this Agreement or the Stock Option Agreement or to consummate the
transactions so contemplated hereby and thereby (subject to the approval and
adoption of this Agreement and the Company Articles Amendment by the Company's
shareholders in accordance with the WBCL and the Company Articles and Company
By-Laws). This Agreement and the Stock Option Agreement have been duly and
validly executed and delivered by Company and, assuming the due authorization,
execution and delivery hereof by Seller, constitute valid and binding
obligations of the Company, enforceable against the Company in accordance with
their respective terms, except as the enforcement thereof may be limited by
applicable bankruptcy, insolvency, reorganization, moratorium or similar laws
generally affecting the rights of creditors and subject to general equity
principles.
 
     SECTION 3.5 NO CONFLICT; REQUIRED FILINGS AND CONSENTS.
 
          (a) The execution and delivery of this Agreement by the Company do
     not, and the performance of this Agreement and the transactions
     contemplated hereby by the Company shall not, (i) conflict with or
 
                                      A-15
<PAGE>   98
 
     violate the Company Articles, as they will be amended by the Company
     Articles Amendment, or Company By-Laws or the Articles of Incorporation or
     By-Laws any Company Subsidiary, (ii) conflict with or violate any Laws
     applicable to the Company or any Company Subsidiary or by which any of
     their respective properties is bound or affected, or (iii) result in any
     breach of or constitute a default (or an event which with notice or lapse
     of time or both would become a default) under, or give to others any rights
     of termination, amendment, acceleration or cancellation of, or result in
     the creation of a lien or encumbrance on any of the properties or assets of
     the Company or any Company Subsidiary pursuant to, any note, bond,
     mortgage, indenture, contract, agreement, lease, license, permit, franchise
     or other instrument or obligation to which the Company or any Company
     Subsidiary is a party or by which the Company or any Company Subsidiary or
     its or any of their respective properties is bound or affected, except for
     any such breaches, defaults or other occurrences that would not,
     individually or in the aggregate, have a Material Adverse Effect on the
     Company and the Company Subsidiaries, taken as a whole.
 
          (b) The execution and delivery of this Agreement by the Company do
     not, and the performance of this Agreement by the Company shall not,
     require any consent, approval, authorization or permit of, or filing with
     or notification to, any governmental or regulatory authority, domestic or
     foreign, except (i) for applicable requirements, if any, of the Securities
     Act, the Exchange Act, Blue Sky Laws, the BHCA, the WBL, the HOLA, the
     filing and recordation of appropriate merger or other documents as required
     by the WBCL, and the listing of the shares of Company Common Stock to be
     issued in the Merger on the NASDAQ/NMS and (ii) where the failure to obtain
     such consents, approvals, authorizations or permits, or to make such
     filings or notifications, would not prevent or delay consummation of the
     Merger, or otherwise prevent the Company from performing its obligations
     under this Agreement, and would not have a Material Adverse Effect on the
     Company and the Company Subsidiaries, taken as a whole.
 
     SECTION 3.6 COMPLIANCE; PERMITS. Except as disclosed in the Company
Disclosure Schedule, neither the Company nor any Company Subsidiary is in
conflict with, or in default or violation of, (i) any Law applicable to the
Company or any Company Subsidiary or by which its or any of their respective
properties is bound or affected, or (ii) any note, bond, mortgage, indenture,
contract, agreement, lease, license, permit, franchise or other instrument or
obligation to which the Company or any Company Subsidiary is a party or by which
the Company or any Company Subsidiary or any of its or any of their respective
properties is bound or affected, except for any such conflicts, defaults or
violations which would not, individually or in the aggregate, have a Material
Adverse Effect on the Company and the Company Subsidiaries, taken as a whole.
 
     SECTION 3.7 SECURITIES AND BANKING REPORTS; FINANCIAL STATEMENTS.
 
          (a) The Company has filed all forms, reports and documents required to
     be filed with the SEC since December 31, 1990, and as of the date of this
     Agreement has delivered to Seller, in the form filed with the SEC, (i) its
     Annual Reports on Form 10-K for the fiscal years ended December 31, 1990,
     1991 and 1992, respectively, (ii) its Quarterly Reports on Form 10-Q for
     the periods ended March 31, 1993 and June 30, 1993, (iii) all proxy
     statements relating to the Company's meetings of shareholders (whether
     annual or special) held since December 31, 1990, (iv) all Reports on Form
     8-K filed by the Company with the SEC since December 31, 1990, (v) all
     other reports or registration statements (other than Reports on Form 10-Q
     not referred to in clause (ii) above) filed by the Company with the SEC
     since December 31, 1990, and (vi) all amendments and supplements to all
     such reports and registration statements filed by the Company with the SEC
     since December 31, 1990 (collectively, the "Company SEC Reports").
 
          (b) The Company and each Company Subsidiary have filed all forms,
     reports and documents required to be filed with the Federal Reserve Board,
     the Wisconsin Commissioner and any other applicable Federal or state
     securities or banking authorities (all such reports and statements are
     collectively referred to with the Company SEC Reports as the "Company
     Reports"). The Company Reports, including all Company Reports filed after
     the date of this Agreement, (i) were or will be prepared in accordance with
     the requirements of applicable Law in all material respects and (ii) did
     not at the time they were filed, or will not at the time they are filed,
     contain any untrue statement of a
 
                                      A-16
<PAGE>   99
 
     material fact or omit to state a material fact required to be stated
     therein or necessary in order to make the statements therein, in light of
     the circumstances under which they were made, not misleading.
 
          (c) Each of the consolidated financial statements (including, in each
     case, any related notes thereto) contained in the Company SEC Reports,
     including any Company SEC Reports filed since the date of this Agreement
     and prior to or on the Effective Time, have been or will be prepared in
     accordance with generally accepted accounting principles applied on a
     consistent basis throughout the periods involved (except as may be
     indicated in the notes thereto) and each fairly presents the consolidated
     financial position of the Company and the Company Subsidiaries as of the
     respective dates thereof and the consolidated results of its operations and
     changes in financial position for the periods indicated, except that any
     unaudited interim financial statements were or will be subject to normal
     and recurring year-end adjustments, which were not or are not expected to
     be material in amount.
 
          (d) Except as and to the extent set forth on the consolidated balance
     sheet of the Company and the Company Subsidiaries as at December 31, 1992,
     including the notes thereto (the "Company Balance Sheet"), neither the
     Company nor any of the Company Subsidiaries has any liabilities or
     obligations of any nature (whether accrued, absolute, contingent or
     otherwise) that would be required to be reflected on a balance sheet, or in
     the notes thereto, prepared in accordance with generally accepted
     accounting principles, except (i) for liabilities or obligations incurred
     in the ordinary course of business since December 31, 1992 that would not,
     individually or in the aggregate, have a Material Adverse Effect on the
     Company and the Company Subsidiaries, taken as a whole, or (ii) as
     otherwise reflected in the Company Reports referred to in clause (ii) of
     Section 3.7(a) hereof. Except as disclosed in the Company Disclosure
     Schedule, neither the Company nor any Company Subsidiary has any
     liabilities or obligations of any nature (whether accrued, absolute,
     contingent or otherwise) that are not required to be reflected on a balance
     sheet, or in the notes thereto, except for liabilities or obligations that
     do not, individually or in the aggregate, have a Material Adverse Effect on
     the Company and the Company Subsidiaries, taken as a whole.
 
     SECTION 3.8 ABSENCE OF CERTAIN CHANGES OR EVENTS. Except as disclosed in
the Company SEC Reports filed prior to the date of this Agreement, since
December 31, 1992 to the date of this Agreement, the Company and the Company
Subsidiaries have conducted their businesses only in the ordinary course and in
a manner consistent with past practice and, since December 31, 1992, there has
not been (i) any change in the financial condition, results of operations or
business of the Company or any of the Company Subsidiaries having a Material
Adverse Effect on the Company and the Company Subsidiaries, taken as a whole,
(ii) any damage, destruction or loss (whether or not covered by insurance) with
respect to any assets of the Company or any of the Company Subsidiaries having a
Material Adverse Effect on the Company and the Company Subsidiaries, taken as a
whole, (iii) any change by the Company in its accounting methods, principles or
practices, (iv) any revaluation by the Company of any of its material assets in
any material respect, (v) any entry by the Company or any of the Company
Subsidiaries into any commitment or transactions material to the Company and the
Company Subsidiaries taken as a whole or (vi) except for regular quarterly cash
dividends of $.37 (for the first quarter of 1993) and $.14 (for the second
quarter of 1993) per share of Company Common Stock with usual record and payment
dates, the three-for-one stock split effected in the form of a 200% stock
dividend distributed on May 28, 1993 and for repurchases of Company Common Stock
pursuant to the Company's Common Stock repurchase program, any declaration,
setting aside or payment of any dividends or distributions in respect of shares
of Company Common Stock or any redemption, purchase or other acquisition of any
of its securities or any of the securities of any Company Subsidiary.
 
     SECTION 3.9 ABSENCE OF LITIGATION. Except as disclosed in the Company
Reports filed prior to the date of this Agreement: (a) neither the Company nor
any of the Company Subsidiaries are subject to any continuing order of, or
written agreement or memorandum of understanding with, or continuing material
investigation by, any federal or state banking or insurance authority or other
governmental entity or authority, or any judgment, order, writ, injunction,
decree or award of any governmental entity or arbitrator, including, without
limitation, cease-and-desist or other orders of any bank regulatory authority,
(b) there is no claim of any kind, action, suit, litigation, proceeding,
arbitration, investigation or controversy affecting the Company or any of the
Company Subsidiaries pending or, to the knowledge of the Company, threatened and
(c) there are
 
                                      A-17
<PAGE>   100
 
no uncured material violations, or violations with respect to which material
refunds or restitutions may be required, cited in any compliance report to the
Company or any of the Company Subsidiaries as a result of the examination by any
bank regulatory authority, except for matters described in clauses (a), (b) and
(c) which, individually or in the aggregate, will not have a Material Adverse
Effect on the Company and the Company Subsidiaries taken as a whole.
 
     SECTION 3.10 EMPLOYEE BENEFIT PLANS.
 
          (a) Compliance with Applicable Laws. Each of the Company's "employee
     benefit plans" within the meaning of Section 3(3) of ERISA, for the benefit
     of employees of the Company and the Company Subsidiaries (the "Company
     Plans") has been operated in all respects in accordance with the
     requirements of all applicable Law and all persons who participate in the
     operation of such Company Plans and all Company Plan "fiduciaries" (within
     the meaning of Section 3(21) of ERISA) have acted in accordance with the
     provisions of all applicable Law except where such violations of applicable
     Law would not, individually or in the aggregate, have a Material Adverse
     Effect on the Company and the Company Subsidiaries, taken as a whole. The
     Company and all Company Subsidiaries have performed all obligations
     required to be performed by any of them under, are not in any respect in
     default under or in violation of, and the Company has no knowledge of any
     default or violation by any party to, any Company Plan, except where such
     failures, defaults or violations would not, individually or in the
     aggregate, have a Material Adverse Effect on the Company and the Company
     Subsidiaries, taken as a whole. No legal action, suit or claim is pending
     or, to the knowledge of the Company, threatened with respect to any Company
     Plan (other than claims for benefits in the ordinary course) and, to the
     knowledge of the Company, no fact or event exists that could give rise to
     any such action, suit or claim. Neither Company nor any Company Subsidiary
     has incurred any material liability to the Pension Benefit Guaranty
     Corporation or any material "withdrawal liability" within the meaning of
     Section 420 of ERISA.
 
          (b) Qualification of Certain Plans. Each Company Plan that is intended
     to be qualified under Section 401(a) of the Code or Section 401(k) of the
     Code has received a favorable determination letter from the IRS (as defined
     herein) that it is so qualified, and each trust established in connection
     with any Company Plan that is intended to be exempt from federal income
     taxation under Section 501(a) of the Code is so exempt, and no fact or
     event has occurred since the date of such determination letter from the IRS
     to adversely affect the qualified status of any Company Plan or the exempt
     status of any such trust. No trust maintained or contributed to by the
     Company or any of the Company Subsidiaries is intended to be qualified as a
     voluntary employees' beneficiary association or is intended to be exempt
     from federal income taxation under Section 501(c)(9) of the Code.
 
          (c) Absence of Certain Liabilities and Events. There have been no
     prohibited transactions (within the meaning of Section 406 of ERISA or
     Section 4975 of the Code) with respect to any Company Plan. The Company and
     each of the Company Subsidiaries has not incurred any liability for any
     excise tax arising under Section 4972 or 4980B of the Code and to the
     Company's knowledge no fact or event exists that could give rise to any
     such liability.
 
          (d) Plan Contributions. All contributions, provisions or payments
     required to be made with respect to any Company Plan have been made on or
     before their due dates.
 
     SECTION 3.11 REGISTRATION STATEMENT; JOINT PROXY STATEMENT. The information
supplied by the Company for inclusion in the registration statement of the
Company (the "Registration Statement") pursuant to which the shares of Company
Common Stock to be issued in the Merger will be registered with the SEC shall
not, at the time the Registration Statement (including any amendments or
supplements thereto) is declared effective by the SEC, contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein, in light of
the circumstances under which they were made, not misleading. The information
supplied by the Company for inclusion in the Joint Proxy Statement shall not, at
the date the Joint Proxy Statement (or any amendment thereof or supplement
thereto) is first mailed to shareholders, at the time of the Company
Shareholders Meeting, at the time of the Seller's Shareholders Meeting and at
the Effective Time, be false or misleading with respect to any material fact
required to be stated therein, or omit to state any material fact necessary in
 
                                      A-18
<PAGE>   101
 
order to make the statements made therein, in light of the circumstances under
which they are made, not misleading; or omit to state any material fact
necessary to correct any statement in any earlier communication with respect to
the solicitation of proxies for the Company Shareholders Meeting or the Seller's
Shareholders Meeting which has become false or misleading. If at any time prior
to the Effective Time any event relating to the Company or any of its
affiliates, officers or directors should be discovered by the Company which
should be set forth in an amendment to the Registration Statement or a
supplement to the Joint Proxy Statement, the Company will promptly inform the
Seller. The Registration Statement and the Joint Proxy Statement shall comply in
all material respects as to form and substance with the requirements of the
Securities Act, the Exchange Act and the rules and regulations thereunder.
Notwithstanding the foregoing, the Company makes no representation or warranty
with respect to any information about, or supplied or omitted by, Seller which
is contained in any of the foregoing documents.
 
     SECTION 3.12 TITLE TO PROPERTY. The Company and each of the Company
Subsidiaries has good and marketable title to all of their respective properties
and assets, real and personal, free and clear of all mortgage liens, and free
and clear of all other liens, charges and encumbrances except liens for taxes
not yet due and payable, pledges to secure deposits and such minor imperfections
of title, if any, as do not, individually or in the aggregate, have a Material
Adverse Effect on the Company and the Company Subsidiaries, taken as a whole;
and all leases pursuant to which the Company or any of the Company Subsidiaries
lease from others material amounts of real or personal property are in good
standing, valid and effective in accordance with their respective terms, and
there is not, under any of such leases, any existing material default or event
of default (or event which with notice or lapse of time, or both, would
constitute a material default and in respect of which the Company or such
subsidiary has not taken adequate steps to prevent such a default from
occurring). Substantially all of the Company's and each of the Company
Subsidiaries' buildings and equipment in regular use have been reasonably
maintained and are in good and serviceable condition, reasonable wear and tear
excepted.
 
     SECTION 3.13 ENVIRONMENTAL MATTERS.
 
          (a) The Company represents and warrants to Seller that, to the best of
     the Company's knowledge (which Seller acknowledges is based on no
     investigation by Company other than customarily undertaken by the Company
     in accordance with its policies) and except as disclosed in the Company
     Disclosure Schedule: (i) Hazardous Materials have not been stored, released
     or disposed of on or from the Company's Property (as defined below) or, to
     the actual knowledge of the Company, any property adjoining the Company's
     Property; (ii) Environmental Permits have been obtained and are in effect
     for the operations conducted at the Company's Property; (iii) the Company
     and the Company Subsidiaries are in compliance in all material respects
     with the requirements of all of their Environmental Permits; and (iv) there
     are no circumstances with respect to any of the Company's Property that
     could reasonably be anticipated (A) to form the basis of an Environmental
     Claim against the Company or the Company Subsidiaries or the Company's
     Property that, individually or in the aggregate, could have a Material
     Adverse Effect on the Company and the Company Subsidiaries, taken as a
     whole, or (B) to cause the Company's Property to be subject to any
     restrictions on ownership, occupancy, use or transferability under any
     applicable Environmental Law.
 
          (b) As used herein "Company Property" means any real property and
     improvements currently owned, leased, used, operated or occupied by the
     Company or any Company Subsidiary, including properties acquired by
     foreclosure or held or operated in a fiduciary or managerial capacity.
 
     SECTION 3.14 ABSENCE OF AGREEMENTS. Neither the Company nor any Company
Subsidiary is a party to any agreement or memorandum of understanding with, or a
party to any commitment letter or similar undertaking to, or is subject to any
order or directive by, or is a recipient of any extraordinary supervisory letter
which restricts materially the conduct of its business (including any contract
containing covenants which limit the ability of the Company or Company
Subsidiary to compete in any line of business or with any person or which
involve any restriction of the geographical area in which, or method by which,
the Company or any Company Subsidiary may carry on its business (other than as
may be required by Law or applicable regulatory authorities)), or in any manner
relates to its capital adequacy, its credit policies or its management, except
for
 
                                      A-19
<PAGE>   102
 
those the existence of which has been disclosed to Seller prior to the date of
this Agreement, nor has the Company been advised that any federal, state, or
governmental agency is contemplating issuing or requesting (or is considering
the appropriateness of issuing or requesting) any such order, decree, agreement,
memorandum of understanding, extraordinary supervisory letter, commitment letter
or similar submission, except as disclosed by the Company in Section 3.14 of the
Company Disclosure Schedule.
 
     SECTION 3.15 TAXES. The Company and the Company Subsidiaries have filed all
Tax Returns required to be filed by them, and the Company and the Company
Subsidiaries have paid and discharged all Taxes due in connection with or with
respect to the filing of such Tax Returns and have paid all other Taxes as are
due, except such as are being contested in good faith by appropriate proceedings
and with respect to which Seller is maintaining reserves adequate for their
payment. To the best of the knowledge of the Company, the liability for Taxes
set forth on each such Tax Return adequately reflects the Taxes required to be
reflected on such Tax Return. For purposes of this Section 3.15, references to
the Company and the Company Subsidiaries include former subsidiaries of the
Company for the periods during which any such corporations were owned, directly
or indirectly, by the Company. Neither the IRS nor any other governmental entity
or taxing authority or agency is now asserting, either through audits,
administrative proceedings, court proceedings or otherwise, or, to the best of
the Company's knowledge, threatening to assert against the Company or any of the
Company Subsidiaries any deficiency or claim for additional Taxes. Neither the
Company nor any of the Company Subsidiaries has granted any waiver of any
statute of limitations with respect to, or any extension of a period for the
assessment of, any Tax. There are no tax liens on any assets of the Company or
any of the Company Subsidiaries. Neither the Company nor any of the Company
Subsidiaries has received a ruling or entered into an agreement with the IRS or
any other governmental entity or taxing authority or agency that would have a
Material Adverse Effect on the Company and the Company Subsidiaries, taken as a
whole, after the Effective Time. The accruals and reserves for Taxes reflected
in the Company Balance Sheet are adequate to cover all Taxes accruable through
the date thereof (including Taxes being contested) in accordance with generally
accepted accounting principles. Except for the Company's and the Company
Subsidiaries' intercompany tax allocation agreements, no agreements relating to
allocating or sharing of Taxes exist among the Company and the Company
Subsidiaries and no tax indemnities given by the Company or the Company
Subsidiaries in connection with a sale of stock or assets remain in effect.
Neither the Company nor any of the Company Subsidiaries is required to include
in income either (i) any material amount in respect of any adjustment under
Section 481 of the Code, or (ii) any material installment sale gain. Neither the
Company nor any of the Company Subsidiaries has made an election under Section
341(f) of the Code.
 
     SECTION 3.16 BROKERS. No broker, finder or investment banker (other than
Salomon Brothers Inc) is entitled to any brokerage, finder's or other fee or
commission in connection with the transactions contemplated by this Agreement
based upon arrangements made by or on behalf of the Company. Prior to the date
of this Agreement, the Company has furnished Seller a complete and correct copy
of all agreements between the Company and Salomon Brothers Inc pursuant to which
such firm would be entitled to any payment relating to the transactions
contemplated hereunder.
 
     SECTION 3.17 ACCOUNTING AND TAX MATTERS. Neither the Company nor, to the
Company's knowledge, any of its affiliates has through the date of this
Agreement taken or agreed to take any action that would prevent the Company from
accounting for the business combination to be effected by the Merger as a
pooling of interests or would prevent the Merger from qualifying as a
reorganization under Section 368(a)(1)(A) of the Code.
 
     SECTION 3.18 MATERIAL ADVERSE EFFECT.
 
          (a) Since December 31, 1992 there has been no Material Adverse Effect
     on the Company and the Company Subsidiaries, taken as a whole.
 
          (b) The consolidated book value of the Company is not less than the
     consolidated book value of the Company as reflected on the Company's
     consolidated financial statements included in the Company's Form 10-Q for
     the quarter ended June 30, 1993.
 
                                      A-20
<PAGE>   103
 
     SECTION 3.19 MATERIAL CONTRACTS. Except as disclosed in the Company
Disclosure Schedule (which may reference other sections of such Schedule), and
except as included as exhibits in the Company SEC Reports, neither the Company
nor any Company Subsidiary is a party to or obligated under any contract,
agreement or other instrument or understanding which would require disclosure by
the Company pursuant to Item 601(b)(10) of Regulation S-K under the Exchange
Act.
 
     SECTION 3.20 FULL DISCLOSURE. No statement contained in any document,
certificate, or other writing furnished or to be furnished by the Company to
Seller in, or pursuant to the provisions of, this Agreement contains or shall
contain any untrue statement of a material fact or omits or shall omit to state
any material fact necessary, in the light of the circumstances under which it
was made, in order to make the statements herein or therein not misleading.
 
     SECTION 3.21 OPINION OF FINANCIAL ADVISER. The Company has received the
oral opinion of Salomon Brothers Inc on or before the date of this Agreement to
the effect that the Exchange Rate is fair to the Company's shareholders from a
financial point of view, and the Company will promptly, when made available to
the Company, deliver a written copy of such opinion to the Seller.
 
     SECTION 3.22 VOTE REQUIRED. The affirmative vote of the holders of
two-thirds of the outstanding shares of Company Common Stock entitled to vote at
the Company Shareholders Meeting is necessary to approve the Company Articles
Amendment, and the affirmative vote of the holders of a majority of the
outstanding shares of Company Common Stock entitled to vote at the Company
Shareholders Meeting is necessary to approve the Merger.
 
                       ARTICLE IV -- COVENANTS OF SELLER
 
     SECTION 4.1 AFFIRMATIVE COVENANTS. Seller hereby covenants and agrees with
the Company that prior to the Effective Time, unless the prior written consent
of the Company shall have been obtained and except as otherwise contemplated
herein, it will and it will cause each Seller Subsidiary to:
 
          (a) operate its business only in the usual, regular and ordinary
     course consistent with past practices;
 
          (b) use all reasonable efforts to preserve intact its business
     organization and assets, maintain its rights and franchises, retain the
     services of its officers and key employees and maintain its relationships
     with customers;
 
          (c) use all reasonable efforts to maintain and keep its properties in
     as good repair and condition as at present, ordinary wear and tear
     excepted;
 
          (d) use all reasonable efforts to keep in full force and effect
     insurance and bonds comparable in amount and scope of coverage to that now
     maintained by it; provided, however, that Seller shall not maintain
     existing insurance policies and/or purchase new insurance policies for
     directors' and officers' liabilities at an aggregate annual premium cost
     equal to or in excess of 150% of the current annual premiums paid by Seller
     on its existing policies;
 
          (e) perform in all material respects all obligations required to be
     performed by it under all material contracts, leases, and documents
     relating to or affecting its assets, properties, and business; and
 
          (f) comply with and perform in all material respects all obligations
     and duties imposed upon it by all applicable Laws.
 
     SECTION 4.2 NEGATIVE COVENANTS. Except as specifically contemplated by this
Agreement and the Stock Option Agreement, from the date of this Agreement until
the Effective Time, Seller shall not do, or permit any of the Seller
Subsidiaries to do, without the prior written consent of the Company, any of the
following:
 
          (a) except as disclosed in Section 4.2(a) of the Seller Disclosure
     Schedule or as provided in Annex C of this Agreement, (i) grant any salary
     increase or bonus increase (in both cases as compared to salary and bonus
     in 1992) to any employee who has an employment contract except as required
     pursuant
 
                                      A-21
<PAGE>   104
 
     to the terms of such contract or a preexisting written bonus or incentive
     compensation plan where the terms of the plan establish an arithmetic
     formula for calculating the total amount of money available for bonuses
     thereunder, provided that no employee who has an employment agreement which
     provides for benefits based in whole or in part on the bonus to such
     employee shall receive a bonus in excess of that received in respect of
     1992, (ii) grant any general salary increase to employees as a class, (iii)
     effect any change in retirement benefits to any class of employees or any
     officer (unless any such change shall be required by contracts existing on
     the date hereof or otherwise by applicable Law) which would increase its
     retirement benefit liabilities, (iv) adopt, enter into, amend or modify any
     Plan or make any adjustments pursuant to any Plan in any manner that
     increases or accelerates Seller's or any Seller Subsidiaries' obligations
     thereunder, or (v) enter into or amend any employment, severance or similar
     agreements or arrangements (whether written or oral) with any employee,
     director or officer or otherwise change the employee-at-will status of any
     current employee;
 
          (b) (i) except as provided below, declare or pay any dividend on, or
     make any other distribution in respect of, its outstanding shares of
     capital stock, except for (A) regular quarterly cash dividends on Seller
     Common Stock with usual record and payment dates for such dividends with
     each such dividend at a rate per share of Seller Common Stock not in excess
     of $.24 and (B) dividends by a Seller Subsidiary to Seller;
 
          (ii) declare or pay any dividends or make any distributions in any
     amount on Seller Common Stock in or with respect to the quarter in which
     the Effective Time shall occur and in which the shareholders of Seller
     Common Stock are entitled to receive dividends on the shares of Company
     Common Stock into which the shares of Seller Common Stock have been
     converted; provided that, it is the intent of this clause (ii) to provide
     that the holders of Seller Common Stock will receive either the payment of
     cash dividends on their shares of Seller Common Stock or the payment of
     cash dividends as the holders of shares of Company Common Stock received in
     exchange for the shares of Seller Common Stock pursuant to this Agreement
     for the calendar quarter during which the Effective Time shall occur, but
     will not receive and will not become entitled to receive for the same
     calendar quarter both the payment of a cash dividend as shareholders of
     Seller Common Stock and the payment of a cash dividend as the holders of
     shares of Company Common Stock received in exchange for the shares of
     Seller Common Stock pursuant to this Agreement; and if Seller does not
     declare and pay cash dividends in a particular calendar quarter because of
     Seller's reasonable expectation that the Effective Time was to have
     occurred in such calendar quarter wherein the holders of Seller Common
     Stock would have become entitled to receive cash dividends for such
     calendar quarter on the shares of Company Common Stock to have been
     exchanged for the shares of Seller Common Stock pursuant to this Agreement,
     and the Effective Time does not in fact occur in such calendar quarter,
     then, as a result thereof, Seller shall be entitled to declare and pay a
     cash dividend (within the limitations of this clause (ii)) on such shares
     of Seller Common Stock for such calendar quarter by the declaration and
     payment of such cash dividends as soon as reasonably practicable after the
     end of such calendar quarter;
 
          (c) (i) redeem, purchase or otherwise acquire any shares of its
     capital stock or any securities or obligations convertible into or
     exchangeable for any shares of its capital stock, or any options, warrants,
     conversion or other rights to acquire any shares of its capital stock or
     any such securities or obligations; (ii) merge with or into any other
     corporation or bank, permit any other corporation or bank to merge into it
     or consolidate with any other corporation or bank, or effect any
     reorganization or recapitalization; (iii) purchase or otherwise acquire any
     substantial portion of the assets, or more than 5% of any class of stock,
     of any corporation, bank or other business other than to acquire the
     capital stock of Pierce County Bank & Trust Company pursuant to the Stock
     Purchase Agreement dated as of May 10, 1993 between Seller and American
     Community Bank Group, Inc. and other than in the ordinary course of
     business and consistent with past practice; (iv) liquidate, sell, dispose
     of, or encumber any assets or acquire any assets, other than in the
     ordinary course of its business consistent with past practice; or (v)
     split, combine or reclassify any of its capital stock or issue or authorize
     or propose the issuance of any other securities in respect of, in lieu of
     or in substitution for shares of its capital stock;
 
                                      A-22
<PAGE>   105
 
          (d) issue, deliver, award, grant or sell, or authorize or propose the
     issuance, delivery, award, grant or sale of, any shares of any class of
     capital stock of Seller or any Seller Subsidiary (including shares held in
     treasury) or any rights, warrants or options to acquire, any such shares,
     other than the issuance by any Seller Subsidiary of shares of its capital
     stock to Seller or the issuance by Seller of Seller Common Stock issuable
     upon exercise of employee stock options outstanding as of the date of this
     Agreement, or the Stock Option Agreement. This limitation shall not
     preclude the purchase of Seller Common Stock in the open market by, or the
     sale of shares by or on behalf of, Seller's Dividend Reinvestment Plan or
     Seller's Thrift and Sharing Plan;
 
          (e) initiate, solicit or encourage (including by way of furnishing any
     information or assistance), or take any other action to facilitate, any
     inquiries or the making of any proposal that constitutes, or may reasonably
     be expected to lead to, any Competing Transaction (as such term is defined
     below), or negotiate with any person in furtherance of such inquiries or to
     obtain a Competing Transaction, or agree to or endorse any Competing
     Transaction, or authorize or permit any of its officers, directors or
     employees or any investment banker, financial advisor, attorney, accountant
     or other representative retained by it or any of the Seller Subsidiaries to
     take any such action and Seller shall immediately notify the Company
     orally, and promptly confirmed in writing, of all of the relevant details
     relating to all inquiries and proposals which it may receive relating to
     any of such matters; provided, however, that nothing contained in this
     subsection (e) shall prohibit the Board of Directors of Seller from (i)
     furnishing or permitting any of its officers, directors, employees,
     investment bankers, financial advisors, attorneys, accountants or other
     representatives to furnish information to any party that requests
     information as to Seller and the Seller Subsidiaries if (A) the Board of
     Directors of Seller, after consultation with legal counsel, determines in
     good faith that such action is required for the Board of Directors of
     Seller to comply with its fiduciary duties to shareholders imposed by Law
     and (B) prior to furnishing such information to such party, Seller receives
     from such party an executed confidentiality agreement in reasonably
     customary form (which need not require such party to enter into a
     "standstill" agreement) or (ii) complying with Rules 14d-2 and 14e-2
     promulgated under the Exchange Act with regard to a Competing Transaction.
     For purposes of this Agreement, "Competing Transaction" shall mean any of
     the following involving Seller or any of the Seller Subsidiaries: (i) any
     merger, consolidation, share exchange, business combination, or other
     similar transaction; (ii) any sale, lease, exchange, mortgage, pledge,
     transfer or other disposition of ten percent or more of assets in a single
     transaction or series of transactions, excluding from the calculation of
     the percentage hereunder any such transactions undertaken in the ordinary
     course of business and consistent with past practice; (iii) any sale of ten
     percent or more of shares of capital stock (or securities convertible or
     exchangeable into or otherwise evidencing, or any agreement or instrument
     evidencing, the right to acquire capital stock); (iv) any tender offer or
     exchange offer for ten percent or more of outstanding shares of capital
     stock or the filing of a registration statement under the Securities Act in
     connection therewith; (v) any solicitation of proxies in opposition to any
     approval by Seller's shareholders of the Merger or the Stock Option
     Agreement; (vi) the filing of an acquisition application (or the giving of
     acquisition notice), whether in draft or final form, under the BHCA or the
     Change in Bank Control Act with respect to Seller; (vii) any person shall
     have acquired beneficial ownership or the right to acquire beneficial
     ownership of, or any "group" (as such term is defined under Section 13(d)
     of the Exchange Act and the rules and regulations promulgated thereunder)
     shall have been formed which beneficially owns or has the right to acquire
     beneficial ownership of, 10% or more of the then outstanding shares of
     capital stock; or (viii) any public announcement of a proposal, plan or
     intention to do any of the foregoing;
 
          (f) propose or adopt any amendments to its articles of incorporation
     or by-laws in any way adverse to the Company;
 
          (g) except in their fiduciary capacities for the account of customers,
     purchase any shares of Company Common Stock;
 
          (h) change any of its methods of accounting in effect at December 31,
     1992, or change any of its methods of reporting income or deductions for
     federal income tax purposes from those employed in the
 
                                      A-23
<PAGE>   106
 
     preparation of the federal income tax returns for the taxable year ending
     December 31, 1992, except as may be required by Law or generally accepted
     accounting principles;
 
          (i) change any lending, investment, liability management or other
     material policies concerning the business or operations of Seller or any of
     the Seller Subsidiaries, except as required by Law, including, without
     limitation: (i) acquire or sell any contracts for the purchase or sale of
     financial or other futures or any put or call options, or enter into any
     hedges or interest rate swaps relating to cash, securities, or any
     commodities whatsoever or enter into any other derivative transaction; (ii)
     except for transactions disclosed in Section 2.12 of the Seller Disclosure
     Schedule, sell, assign, transfer, pledge, mortgage or otherwise encumber,
     or permit any encumbrances to exist with respect to, any of its assets with
     a value in excess of $500,000 individually; (iii) make any investment with
     an interest maturity of five years or more except for investment securities
     not aggregating in principal amount more than $20,000,000; (iv) except as
     disclosed in the Seller Disclosure Schedule, incur any material liabilities
     or material obligations, whether directly or by way of guaranty, including
     any obligation for borrowed money, whether or not evidenced by a note,
     bond, debenture or similar instrument, except pursuant to existing credit
     agreements and other borrowing facilities filed as exhibits to the Seller
     SEC Reports or otherwise disclosed to the Company pursuant to this
     Agreement and in the ordinary course of business consistent with past
     practice, or otherwise in an aggregate amount of $1,000,000 or less; (v)
     enter into any agreement with respect to any acquisition of a material
     amount of assets or securities or any discharge, waiver, satisfaction,
     release or relinquishment of any material contract rights, liens,
     encumbrances, debt or claims, not in the ordinary course of business and
     consistent with past practices, except which together amount to less than
     $1,000,000; (vi) settle any claim, action, suit, litigation, proceeding,
     arbitration, investigation or controversy of any kind, for any amount in
     excess of $300,000 or in any manner which would restrict in any material
     respect the operations or business of Seller or any of the Seller
     Subsidiaries; (vii) purchase any derivative securities instrument which
     involves entering into a contract with a term of six months or longer;
     (viii) make any capital expenditure, except in the ordinary course and
     consistent with past practice, except which together amount to less than
     $1,000,000; or (ix) take any action or fail to take any action which,
     individually or in the aggregate, can be expected to have a Material
     Adverse Effect on the Seller and the Seller Subsidiaries, taken as a whole;
 
          (j) agree in writing or otherwise to do any of the foregoing.
 
     SECTION 4.3 LETTER OF SELLER'S ACCOUNTANTS. Seller shall use its best
efforts to cause to be delivered to the Company "comfort" letters of Arthur
Andersen & Co., Seller's independent public accountants, dated the date on which
the Registration Statement shall become effective and the Effective Time,
respectively, and addressed to the Company, in form and substance reasonably
satisfactory to the Company and reasonably customary in scope and substance for
letters delivered by independent public accountants in connection with
registration statements similar to the Registration Statement and transactions
such as those contemplated by this Agreement.
 
     SECTION 4.4 ACCESS AND INFORMATION.
 
          (a) Until the Effective Time and upon reasonable notice, Seller shall
     (and shall cause each Seller Subsidiary to) afford to the Company's
     officers, employees, accountants, legal counsel and other representatives
     access, during normal business hours, to all its properties, books,
     contracts, commitments and records. Prior to the Effective Time, Seller
     shall (and shall cause each Seller Subsidiary to) furnish promptly (as soon
     as available or received by Seller or any Seller Subsidiary) to the Company
     (i) a copy of each Seller Report filed by it or received by it (to the
     extent not prohibited by Law and if so prohibited the Seller shall promptly
     so notify the Company) after the date of this Agreement and prior to the
     Effective Time pursuant to the requirements of federal or state securities
     laws, the BHCA, any other federal or state banking laws or any other
     applicable Laws promptly after such documents are available, (ii) to the
     extent they are prepared, the monthly financial statements of Seller and
     the Seller Subsidiaries (as prepared by Seller in accordance with its
     normal accounting procedures) promptly after such financial statements are
     available without further request by the Company, (iii) a copy of any
     action, including all minutes, taken by the Board of Directors, or any
     committee thereof, of Seller and the Seller
 
                                      A-24
<PAGE>   107
 
     Subsidiaries and any documents or other materials of any kind provided to
     such Boards or Committees promptly after such action, minutes, materials or
     other documents become available without further request by the Company,
     (iv) a copy of each federal Tax Return filed by Seller for the three most
     recent years available, a copy of any correspondence received from the IRS
     or any other governmental entity or taxing authority or agency and any
     other correspondence relating to Taxes, and any other documents relating to
     Taxes as the Company may reasonably request, and (v) all other information
     concerning the business, properties and personnel of Seller or any Seller
     Subsidiary as the Company may reasonably request.
 
          (b) Unless otherwise required by Law, the Company will hold any such
     information which is nonpublic in confidence in accordance with the terms
     of the confidentiality agreements in effect between the parties on the date
     of this Agreement.
 
     SECTION 4.5 UPDATE DISCLOSURE; BREACHES.
 
          (a) From and after the date of this Agreement until the Effective
     Time, Seller shall update the Seller Disclosure Schedule on a monthly basis
     by written notice to the Company to reflect any matters which have occurred
     from and after the date of this Agreement which, if existing on the date of
     this Agreement, would have been required to be described therein; provided
     that, without limiting the Company's rights under Section 4.4, (i) to the
     extent that any information that would be required to be included in an
     update under this Section 4.5(a) would have in the past been contained in
     internal reports prepared by Seller or any Seller Subsidiary in the
     ordinary course, such update may occur by delivery of such internal reports
     prepared in accordance with past practice, with appropriate steps taken by
     Seller to identify relevant information contained therein, and (ii) to the
     extent that monthly updating required under this Section is unduly
     burdensome to Seller, Seller and the Company will use their best efforts to
     develop alternate updating procedures utilizing, wherever possible,
     existing reporting systems.
 
          (b) Seller shall, in the event it becomes aware of the impending or
     threatened occurrence of any event or condition which would cause or
     constitute a material breach (or would have caused or constituted a
     material breach had such event occurred or been known prior to the date of
     this Agreement) of any of its representations or agreements contained or
     referred to herein, give prompt written notice thereof to the Company and
     use its best efforts to prevent or promptly remedy the same.
 
     SECTION 4.6 AFFILIATES; ACCOUNTING AND TAX TREATMENT. Within thirty (30)
days after the date of this Agreement, (a) Seller shall deliver to the Company a
letter identifying all persons who are then "affiliates" of Seller, including,
without limitation, all directors and executive officers of Seller, for purposes
of Rule 145 promulgated under the Securities Act and (b) Seller shall advise the
persons identified in such letter of the resale restrictions imposed by
applicable securities laws and required to cause the Merger to qualify for
pooling-of-interests accounting treatment, and shall use reasonable efforts to
obtain from each person identified in such letter a written agreement,
substantially in the form attached hereto as Exhibit 4.6. Seller shall use its
best efforts to obtain from any person who becomes an affiliate of Seller after
Seller's delivery of the letter referred to above, and on or prior to the
Effective Time, a written agreement substantially in the form attached hereto as
Exhibit 4.6 as soon as practicable after attaining such status. Seller will use
its best efforts to cause the Merger to qualify for pooling-of-interests
accounting treatment and as a reorganization under Section 368(a)(1)(A) of the
Code.
 
     SECTION 4.7 EXPENSES.
 
          (a) All Expenses (as defined below) incurred by the Company and Seller
     shall be borne solely and entirely by the party which has incurred the
     same, except that the parties shall share equally in the expense of
     printing and filing the Registration Statement and the Joint Proxy
     Statement and all SEC and other regulatory filing fees incurred in
     connection herewith.
 
          (b) "Expenses" as used in this Agreement shall include all reasonable
     out-of-pocket expenses (including, without limitation, all fees and
     expenses of counsel, accountants, investment bankers, experts and
     consultants to the party and its affiliates) incurred by a party or on its
     behalf in connection with or related to the authorization, preparation and
     execution of this Agreement and the Stock Option
 
                                      A-25
<PAGE>   108
 
     Agreement, the solicitation of shareholder approvals and all other matters
     related to the closing of the transactions contemplated hereby and by the
     Stock Option Agreement.
 
     SECTION 4.8 DELIVERY OF SHAREHOLDER LIST. Seller shall arrange to have its
transfer agent deliver to the Company or its designee, from time to time prior
to the Effective Time, a true and complete list setting forth the names and
addresses of the Seller shareholders, their holdings of stock as of the latest
practicable date, and such other shareholder information as the Company may
reasonably request. The Company agrees to retain such information as
confidential in accordance with its confidentiality agreement in effect with
Seller.
 
     SECTION 4.9 COMPANY REPRESENTATIVES. The Company shall have the right to
designate at least two (2) representatives to attend all meetings of Seller's
Senior Credit Committee, or similar committee at any Seller Subsidiary
designated by the Company, and Seller shall ensure that such representatives
receive all information given by Seller or its agents to Seller's members of
such committees. The intention of this Section 4.9 is that such representatives
shall attend such meetings only as observers.
 
     SECTION 4.10 Seller shall use all reasonable efforts to maintain the
listing of Seller Common Stock on the NASDAQ/NMS at least through the record
date for the Seller Shareholders Meeting.
 
                     ARTICLE V -- COVENANTS OF THE COMPANY
 
     SECTION 5.1 AFFIRMATIVE COVENANTS. The Company hereby covenants and agrees
with Seller that prior to the Effective Time, unless the prior written consent
of Seller shall have been obtained and except as otherwise contemplated herein,
it will:
 
          (a) maintain its corporate existence in good standing and maintain all
     books and records in accordance with accounting principles and practices as
     utilized in the Company's financial statements applied on a consistent
     basis; and
 
          (b) conduct its business in a manner that does not violate any Law,
     except for possible violations which individually or in the aggregate do
     not, and, insofar as reasonably can be foreseen, in the future will not,
     have a Material Adverse Effect on the Company and the Company Subsidiaries,
     taken as a whole.
 
     SECTION 5.2 NEGATIVE COVENANTS. Except as specifically contemplated by this
Agreement, from the date of this Agreement until the Effective Time, the Company
shall not do, or agree or commit to do, or permit any of the Company
Subsidiaries to do, without the prior written consent of Seller any of the
following:
 
          (a) propose or adopt any amendments to its articles of incorporation
     or by-laws in any way adverse to Seller; provided, however, that the
     Company Articles Amendment to increase the authorized number of shares of
     Company Common Stock, and any amendment to the by-laws of the Company to
     increase the size of its Board of Directors to accommodate the persons
     specified in Annex A shall not be deemed adverse to Seller;
 
          (b) agree in writing or otherwise to do the foregoing.
 
     SECTION 5.3 ACCESS AND INFORMATION.
 
          (a) Until the Effective Time, upon reasonable notice, the Company
     shall (and shall cause each Company Subsidiary to) afford to Seller's
     officers, employees, accountants, legal counsel and other representatives
     access, during normal business hours, to all its properties, books,
     contracts, commitments and records. Prior to the Effective Time, the
     Company shall (and shall cause each Subsidiary to) furnish promptly (as
     soon as available or received by the Company or any Company Subsidiary) to
     Seller (i) a copy of each Company Report filed by it or received by it (to
     the extent not prohibited by Law and if so prohibited the Company shall
     promptly so notify the Seller) after the date of this Agreement and prior
     to the Effective Time pursuant to the requirements of federal or state
     securities laws, the BHCA, any other federal or state banking laws or any
     other applicable Laws promptly after such documents are available and (ii)
     all other information concerning the business, properties and personnel of
     the Company or the Company Subsidiaries as Seller may reasonably request.
 
                                      A-26
<PAGE>   109
 
          (b) Unless otherwise required by Law, Seller will hold any such
     information which is nonpublic in confidence pursuant to the terms of the
     confidentiality agreements in effect between the parties on the date of
     this Agreement.
 
     SECTION 5.4 UPDATE DISCLOSURE; BREACHES.
 
          (a) From and after the date of this Agreement until the Effective
     Time, Company shall update the Company Disclosure Schedule on a monthly
     basis by written notice to the Seller to reflect any matters which have
     occurred from and after the date of this Agreement which, if existing on
     the date of this Agreement, would have been required to be described
     therein; provided that, without limiting the Seller's rights under Section
     5.3, (i) to the extent that any information that would be required to be
     included in an update under this Section 5.4(a) would have in the past been
     contained in internal reports prepared by Company or any Company Subsidiary
     in the ordinary course, such update may occur by delivery of such internal
     reports prepared in accordance with past practice, with appropriate steps
     taken by Company to identify relevant information contained therein, and
     (ii) to the extent that monthly updating required under this Section is
     unduly burdensome to the Company, the Company and the Seller will use their
     best efforts to develop alternative updating procedures utilizing, wherever
     possible, existing reporting systems.
 
          (b) The Company shall, in the event it becomes aware of the impending
     or threatened occurrence of any event or condition which would cause or
     constitute a material breach (or would have caused or constituted a
     material breach had such event occurred or been known prior to the date of
     this Agreement) of any of its representations or agreements contained or
     referred to herein, give prompt written notice thereof to the Seller and
     use its best efforts to prevent or promptly remedy the same.
 
     SECTION 5.5 STOCK EXCHANGE LISTING. The Company shall use all reasonable
efforts to cause the shares of Company Common Stock to be issued in the Merger
or pursuant to options to be granted in connection therewith to be approved for
listing on the NASDAQ/NMS prior to the Effective Time.
 
     SECTION 5.6 COMPANY BOARD OF DIRECTORS. Promptly after the Effective Time,
the Company shall cause the number of directors on its Board of Directors to be
increased to accommodate appointment of the persons designated by Seller on
Annex A, and will appoint such persons as directors.
 
     SECTION 5.7 ACCOUNTING AND TAX TREATMENT. The Company will use its best
efforts to cause the Merger to qualify for pooling-of-interests accounting
treatment and as a reorganization under Section 368(a)(1)(A) of the Code.
 
     SECTION 5.8 EMPLOYMENT MATTERS.
 
          (a) Prior to the Effective Time, the Company will offer employment
     agreements in the forms attached hereto as part of Annex C to the following
     individuals: Peter M. Platten III, Mark Miller, Gary Lichtenberg, Charles
     Sauter, and Sal Troia. This commitment, including the commitment to grant
     stock options contained in such agreements, is subject to approval of the
     Securities and Exchange Commission that qualification of the Merger for
     pooling-of-interests accounting treatment will not be adversely affected
     because of such commitment.
 
          (b) The Company hereby acknowledges the obligations of Seller under
     the Employment Agreements referred to in Section 2.10(a) of the Seller
     Disclosure Schedule, which will become obligations of the Company following
     the Effective Time. Notwithstanding the continued employment of such
     persons by the Company, it is understood and agreed that each of the
     individuals referred to in paragraph (a), above, may, at his election made
     after the Effective Time, be treated as if a "change of control
     termination" occurred under the Employment Agreement between such
     individual and Seller, and the date of such election shall be deemed the
     "Termination Date" for purposes of such agreements.
 
                      ARTICLE VI -- ADDITIONAL AGREEMENTS
 
     SECTION 6.1 JOINT PROXY STATEMENT; REGISTRATION STATEMENT. As promptly as
practicable after the execution of this Agreement, Seller and the Company shall
prepare and file with the SEC a combined proxy
 
                                      A-27
<PAGE>   110
 
and registration statement on Form S-4 promulgated under the Securities Act and
the Exchange Act (or on such other form as shall be appropriate) relating to the
approval of the Merger by the shareholders of Seller and the approval of the
Merger and the Company Articles Amendment by the shareholders of the Company and
shall use all reasonable efforts to cause the Registration Statement to become
effective as soon thereafter as practicable. The Joint Proxy Statement shall
include the recommendation of the Board of Directors of the Seller and the
Company in favor of the Merger; provided, however, that if the Board of
Directors of either Seller or the Company shall, in good faith, determine that
to make such recommendation would be a violation of such Board's fiduciary
obligations under Law, then the Board of Directors making such determination
shall not be obligated to make such recommendation.
 
     SECTION 6.2 MEETINGS OF SHAREHOLDERS.
 
          (a) Seller shall promptly after the date of this Agreement take all
     action necessary in accordance with the WBCL and the Seller Articles and
     the Seller By-Laws to convene the Seller Shareholders Meeting. Seller shall
     consult with the Company and use all reasonable efforts to hold the Seller
     Shareholders Meeting on the same day as the Company Shareholders Meeting.
     Seller shall use its best efforts to solicit from shareholders of Seller
     proxies with respect to the Merger and shall take all other action
     necessary or advisable to secure the vote or consent of shareholders
     required by the WBCL to take action on the Merger.
 
          (b) The Company shall promptly after the date of this Agreement take
     all action necessary in accordance with the WBCL, the Company Articles and
     the Company By-Laws to convene the Company Shareholders Meeting. The
     Company shall consult with Seller and shall use all reasonable efforts to
     hold the Company Shareholders Meeting on the same day as the Seller
     Shareholders Meeting. The Company shall use its best efforts to solicit
     from shareholders of the Company proxies with respect to the Merger and the
     Company Articles Amendment and shall take all other action necessary or
     advisable to secure the vote or consent of shareholders required by the
     WBCL to take action on the Merger and the Company Articles Amendment.
 
     SECTION 6.3 APPROPRIATE ACTION; CONSENTS; FILINGS. Seller and the Company
shall use all reasonable efforts to (i) take, or cause to be taken, all
appropriate action, and do, or cause to be done, all things necessary, proper or
advisable under applicable Law to consummate and make effective the transactions
contemplated by this Agreement, (ii) obtain all consents, licenses, permits,
waivers, approvals, authorizations or orders required under Law (including,
without limitation, all foreign and domestic (federal, state and local)
governmental and regulatory rulings and approvals and parties to contracts)
required in connection with the authorization, execution and delivery of this
Agreement and the Stock Option Agreement and the consummation by them of the
transactions contemplated hereby and thereby, including, without limitation, the
Merger and the issuance of Seller Common Stock pursuant to the Stock Option
Agreement, (iii) make all necessary filings, and thereafter make any other
required submissions, with respect to this Agreement, the Merger and the Stock
Option Agreement required under (A) the Securities Act and the Exchange Act and
the rules and regulations thereunder, and any other applicable federal or state
securities laws, (B) the BHCA, the HOLA, the WBL and any other applicable
federal or state banking laws and (C) any other applicable Law; provided that,
the Company and Seller shall cooperate with each other in connection with the
making of all such filings, including providing copies of all such documents to
the non-filing party and its advisors prior to filing and, if requested, to
accept all reasonable additions, deletions or changes suggested in connection
therewith. Seller and the Company shall furnish all information required for any
application or other filing to be made pursuant to the rules and regulations of
any applicable Law (including all information required to be included in the
Joint Proxy Statement and the Registration Statement) in connection with the
transactions contemplated by this Agreement. In case at any time after the
Effective Time any further action is necessary or desirable to carry out the
purposes of this Agreement, the proper officers and directors of each party to
this Agreement shall use all reasonable efforts to take all such necessary
action.
 
     SECTION 6.4 EMPLOYEE STOCK OPTIONS AND OTHER EMPLOYEE BENEFIT
MATTERS. Annex C hereto sets forth certain agreements with respect to Seller's
employee stock options and other employee benefit matters.
 
                                      A-28
<PAGE>   111
 
     SECTION 6.5 DIRECTORS' AND OFFICERS' INDEMNIFICATION AND INSURANCE.
 
          (a) By virtue of the occurrence of the Merger, the Company shall from
     and after the Effective Time succeed to Seller's obligations with respect
     to indemnification or exculpation now existing in favor of the directors,
     officers, employees and agents of Seller and the Seller Subsidiaries as
     provided in the WBL, the Seller Articles, Seller By-Laws, indemnification
     agreements of Seller or the Seller Subsidiaries or otherwise in effect as
     of the date of this Agreement with respect to matters occurring prior to
     the Effective Time. Section 6.5 of the Seller Disclosure Schedule contains
     a complete list of all indemnification arrangements to which Seller is a
     party to on the date of this Agreement. Seller agrees not to amend or enter
     into new arrangements or agreements from and after the date hereof.
 
          (b) From and after the Effective Time, the Company shall indemnify,
     defend and hold harmless each person who is now, or has been at any time
     prior to the date hereof or who becomes prior to the Effective Time, an
     officer, director or employee of Seller or any Seller Subsidiary (the
     "Indemnified Parties") against (i) all losses, claims, damages, costs,
     expenses, liabilities or judgments or amounts that are paid in settlement
     with the approval of the Company (which approval shall not be unreasonably
     withheld) of or in connection with any claim, action, suit, proceeding or
     investigation based in whole or in part on or arising in whole or in part
     out of the fact that such person is or was a director, officer or employee
     of Seller or any Seller Subsidiary, whether pertaining to any matter
     existing or occurring at or prior to the Effective Time and whether
     asserted or claimed prior to, or at or after, the Effective Time
     ("Indemnified Liabilities") and (ii) all Indemnified Liabilities based in
     whole or in part on, or arising in whole or in part out of, or pertaining
     to this Agreement or the transactions contemplated hereby, in each case to
     the full extent Seller would have been permitted under Wisconsin law and
     the Seller Articles and Seller By-Laws to indemnify such person (and the
     Company shall pay expenses in advance of the final disposition of any such
     action or proceeding to each Indemnified Party to the full extent permitted
     by law upon receipt of any affirmation and undertaking required by Section
     180.0853 of the WBCL. Without limiting the foregoing, in the event any such
     claim, action, suit, proceeding or investigation is brought against any
     Indemnified Party (whether arising before or after the Effective Time), (i)
     any counsel retained by the Indemnified Parties for any period after the
     Effective Time shall be reasonably satisfactory to the Company; (ii) after
     the Effective Time, the Company shall pay all reasonable fees and expenses
     of such counsel for the Indemnified Parties promptly as statements therefor
     are received; and (iii) after the Effective Time, the Company will use all
     reasonable efforts to assist in the vigorous defense of any such matter,
     provided that the Company shall not be liable for any settlement of any
     claim effected without its written consent, which consent, however, shall
     not be unreasonably withheld. Any Indemnified Party wishing to claim
     indemnification under this Section 6.5, upon learning of any such claim,
     action, suit, proceeding or investigation, shall notify the Company (but
     the failure so to notify the Company shall not relieve it from any
     liability which it may have under this Section 6.5 except to the extent
     such failure materially prejudices the Company), and shall deliver to the
     Company the affirmation and undertaking, if any, required by Section
     180.0853 of the WBCL. The Indemnified Parties as a group may retain only
     one law firm to represent them with respect to each such matter unless
     there is, under applicable standards of professional conduct, a conflict on
     any significant issue between the positions of any two or more Indemnified
     Parties.
 
          (c) For a period of three years after the Effective Time, the Company
     shall cause to be maintained in effect the current policies of directors'
     and officers' liability insurance maintained by Seller (provided that the
     Company may substitute therefore policies of at least the same coverage and
     amounts containing terms and conditions which are no less advantageous)
     with respect to claims arising from facts or events which occurred before
     the Effective Time; provided, however, that the Company shall not be
     obligated to make annual premium payments for such insurance to the extent
     such premiums exceed 250% of the premiums paid as of the date hereof by
     Seller for such insurance.
 
          (d) The provisions of this Section 6.5 are intended to be for the
     benefit of, and shall be enforceable by, each Indemnified Party, his or her
     heirs and his or her representatives.
 
                                      A-29
<PAGE>   112
 
     SECTION 6.6 NOTIFICATION OF CERTAIN MATTERS. Seller shall give prompt
notice to the Company, and the Company shall give prompt notice to Seller, of
(i) the occurrence, or non-occurrence, of any event the occurrence, or
non-occurrence, of which would be likely to cause any representation or warranty
contained in this Agreement to be untrue or inaccurate and (ii) any failure of
Seller or the Company, as the case may be, to comply with or satisfy any
covenant, condition or agreement to be complied with or satisfied by it
hereunder; provided, however, that the delivery of any notice pursuant to this
Section 6.6 shall not limit or otherwise affect the remedies available hereunder
to the party receiving such notice.
 
     SECTION 6.7 PUBLIC ANNOUNCEMENTS. The Company and Seller shall consult with
each other before issuing any press release or otherwise making any public
statements with respect to the Merger and shall not issue any such press release
or make any such public statement prior to such consultation, except as may be
required by Law or any listing agreement with the National Association of
Securities Dealers, Inc.
 
                      ARTICLE VII -- CONDITIONS OF MERGER
 
     SECTION 7.1 CONDITIONS TO OBLIGATION OF EACH PARTY TO EFFECT THE
MERGER. The respective obligations of each party to effect the Merger shall be
subject to the satisfaction at or prior to the Effective Time of the following
conditions:
 
          (a) Effectiveness of the Registration Statement. The Registration
     Statement shall have been declared effective by the SEC under the
     Securities Act. No stop order suspending the effectiveness of the
     Registration Statement shall have been issued by the SEC and no proceedings
     for that purpose shall, on or prior to the Effective Time, have been
     initiated or, to the knowledge of the Company or Seller, threatened by the
     SEC. The Company shall have received all other federal or state securities
     permits and other authorizations necessary to issue Company Common Stock in
     exchange for Seller Common Stock and to consummate the Merger.
 
          (b) Shareholder Approval. This Agreement and the Merger shall have
     been approved and adopted by the requisite vote of the shareholders of
     Seller and of the Company.
 
          (c) Federal Reserve Board. The Merger shall have been approved by the
     Federal Reserve Board, which approval shall not contain any condition which
     is not reasonably satisfactory to the Company and the Seller. All
     conditions required to be satisfied prior to the Effective Time imposed by
     the terms of such approval shall have been satisfied and all waiting
     periods relating to such approval shall have expired.
 
          (d) No Order. No federal or state governmental or regulatory authority
     or other agency or commission, or federal or state court of competent
     jurisdiction, shall have enacted, issued, promulgated, enforced or entered
     any statute, rule, regulation, executive order, decree, injunction or other
     order (whether temporary, preliminary or permanent) which is in effect
     restricting, preventing or prohibiting consummation of the transactions
     contemplated by this Agreement.
 
          (e) No Challenge. There shall not be pending any action, proceeding or
     investigation before any court or administrative agency or by any
     government agency or any other person (i) challenging or seeking material
     damages in connection with, the Merger or the conversion of Seller Common
     Stock into Company Common Stock pursuant to the Merger or (ii) seeking to
     restrain, prohibit or limit the exercise of full rights of ownership or
     operation by the Company or the Company Subsidiaries of all or any portion
     of the business or assets of Seller, which in either case is reasonably
     likely to have a Material Adverse Effect on either Seller or the Seller
     Subsidiaries, taken as a whole, or the Company and the Company
     Subsidiaries, taken as a whole.
 
          (f) Shareholder Approval of Company Articles Amendment. The Company
     Articles Amendment necessary to complete the Merger shall have been
     approved and adopted by the requisite vote of the shareholders of the
     Company.
 
          (g) Fractional Shares; Dissenters. The aggregate of (i) the fractional
     share interests in Company Common Stock to be paid in cash pursuant to
     Section 1.7 of this Agreement and (ii) the shares of Company Common Stock
     that would be issuable by virtue of the Merger with respect to shares of
     Seller
 
                                      A-30
<PAGE>   113
 
     Common Stock outstanding on the record date for the Seller Shareholders
     Meeting that will not be converted into Company Common Stock due, directly
     or indirectly, to the exercise of dissenters' rights, if available under
     Wisconsin law, shall not be more than 10% of the maximum aggregate number
     of shares of Company Common Stock which could be issued as a result of the
     Merger.
 
     SECTION 7.2 ADDITIONAL CONDITIONS TO OBLIGATIONS OF THE COMPANY. The
obligations of the Company to effect the Merger are also subject to the
following conditions:
 
          (a) Representations and Warranties. Each of the representations and
     warranties of Seller contained in this Agreement, without giving effect to
     any update to the Seller Disclosure Schedule or notice to the Company under
     Section 4.5 or 6.6, shall be true and correct in all material respects
     (except that where any statement in a representation or warranty expressly
     includes a standard of materiality, such statement shall be true and
     correct in all respects) as of the Effective Time as though made on and as
     of the Effective Time, except for those representations and warranties
     which address matters only as of a particular date (which shall remain true
     and correct as of such date), with the same force and effect as if made on
     and as of the Effective Time. The Company shall have received a certificate
     of the President and Chief Financial Officer of Seller to that effect.
 
          (b) Agreements and Covenants. Seller shall have performed or complied
     in all material respects with all agreements and covenants required by this
     Agreement to be performed or complied with by it on or prior to the
     Effective Time.
 
          (c) Consents Obtained. All consents, waivers, approvals,
     authorizations or orders required to be obtained, and all filings required
     to be made by Seller for the authorization, execution and delivery of this
     Agreement and the consummation by it of the transactions contemplated
     hereby shall have been obtained and made by Seller, except where the
     failure to obtain any consents, waivers, approvals, authorizations or
     orders required to be obtained or any filings required to be made would not
     have a Material Adverse Effect on the Seller and the Seller Subsidiaries,
     taken as a whole.
 
          (d) Opinion of Counsel. The Company shall have received from Quarles &
     Brady, or other independent counsel for Seller reasonably satisfactory to
     the Company, an opinion dated the Effective Time, in form and substance
     reasonably satisfactory to the Company, covering the matters set forth in
     Annex D hereto, which opinion shall be based on such assumptions and
     contain such qualifications and limitations as are appropriate and
     reasonably satisfactory to the Company.
 
          (e) Tax Opinion. An opinion of Godfrey & Kahn, S.C., independent
     counsel to the Company, to the effect that the Merger will be treated for
     federal income tax purposes as a reorganization within the meaning of
     Section 368(a) of the Code, and that the Company and Seller will each be a
     party to that reorganization within the meaning of Section 368(b) of the
     Code, dated on or about the date that is two business days prior to the
     date the Joint Proxy Statement is first mailed to shareholders of Seller
     and the Company and such opinion shall have been delivered and shall not
     have been withdrawn or modified in any material respect.
 
          (f) Comfort Letters. The Company shall have received from Arthur
     Andersen & Co. the "comfort" letters referred to in Section 4.3.
 
          (g) Pooling Opinions. The Company shall have received an opinion from
     Arthur Andersen & Co. to the effect that the Merger qualifies for
     pooling-of-interests accounting treatment if consummated in accordance with
     this Agreement.
 
          (h) Affiliate Agreements. The Company shall have received from each
     person who is identified in the affiliate letter as an "affiliate" of
     Seller a signed affiliate agreement in the form attached hereto as Exhibit
     4.6.
 
          (i) Burdensome Condition. There shall not be any action taken, or any
     statute, rule, regulation or order enacted, entered, enforced or deemed
     applicable to the Merger, by any federal or state governmental entity
     which, in connection with the grant of any regulatory approval, imposes any
     condition or restriction upon the Company or Seller or their respective
     subsidiaries (or the Surviving Corporation or
 
                                      A-31
<PAGE>   114
 
     its subsidiaries after the Effective Time), which would materially
     adversely impact the economic or business benefits of the transactions
     contemplated by this Agreement in such a manner as to render inadvisable
     the consummation of the Merger.
 
          (j) Options/Benefits. Seller shall have delivered to the Company
     evidence in form reasonably satisfactory to the Company that all holders of
     options to purchase Seller Common Stock (including those listed on Annex C
     but excluding the Stock Option Agreement) shall have waived any right to
     receive cash in exchange for or upon surrender of any such option.
 
          (k) Rights Plan. No "Shares Acquisition Date," "Distribution Date" or
     "Triggering Event" shall have occurred under the Seller Rights Plan.
 
          (l) No Material Adverse Changes.
 
             (i) Since the date of the Agreement, there has not been any change
        in the financial condition, results of operations or business of the
        Seller and the Seller Subsidiaries, taken as a whole, that, either
        individually or in the aggregate, would have a Material Adverse Effect
        on the Seller and the Seller Subsidiaries taken as a whole. The Company
        shall have received a certificate of the President and the Chief
        Financial Officer of the Seller to that effect.
 
             (ii) The cumulative consolidated net income reported (as defined
        below) by Seller for the calendar quarters commencing with the third
        quarter of 1993 and ending with the last quarter reported prior to the
        Effective Time (the "Measurement Period") shall be greater than or equal
        to the product of (i) $10,000,000 and (ii) the number of full calendar
        quarters for which Seller's consolidated results are reported in the
        Measurement Period. As used in this Section, "reported" means reported
        in Seller's financial statements prepared in accordance with generally
        accepted accounting principles applied on a basis consistent with
        Seller's financial statements for the years ended December 31, 1991 and
        1992, as included in Seller's reports to the SEC on Form 10-Q or Form
        10-K with the following adjustments, if any, net of related tax savings
        and costs which were reflected in net income for the relevant period(s)
        added back into or deducted from consolidated net income for the
        applicable period: (i) investment banking expenses, outside legal and
        accounting fees, or other costs associated with the Merger, and (ii) any
        other expenses upon which the Company and Seller shall mutually agree.
 
          (m) Seller Capitalization. The number of shares of Seller Common Stock
     outstanding plus the number of shares of Seller Common Stock subject to
     issuance pursuant to outstanding stock options (other than the Stock Option
     Agreement) shall not be greater than 21,620,742.
 
          (n) Life Insurance Contracts. Each of the following individuals will
     have executed a written agreement which amends Section 6.2 of the Executive
     Life Insurance Plan Agreement between such individual and Seller to limit
     the insurance coverage to one times base compensation for 1993 for both
     pre-retirement and post-retirement: Peter M. Platten III, Mark Miller, Gary
     Lichtenberg, Charles Sauter, and Sal Troia.
 
     SECTION 7.3 ADDITIONAL CONDITIONS TO OBLIGATIONS OF SELLER. The obligation
of Seller to effect the Merger is also subject to the following conditions:
 
          (a) Representations and Warranties. Each of the representations and
     warranties of the Company contained in this Agreement, without giving
     effect to any notice to Seller under Section 5.4 or 6.6, shall be true and
     correct in all material respects (except that where any statement in a
     representation or warranty expressly includes a statement of materiality,
     such statement shall be true and correct in all respects) as of the
     Effective Time, as though made on and as of the Effective Time, except for
     those representations and warranties which address matters only as of a
     particular date (which shall remain true and correct as of such date), with
     the same force and effect as if made on and as of the Effective Time.
     Seller shall have received a certificate of the President and Chief
     Financial Officer of the Company to that effect.
 
                                      A-32
<PAGE>   115
 
          (b) Agreements and Covenants. The Company shall have performed or
     complied in all material respects with all agreements and covenants
     required by this Agreement to be performed or complied with by it on or
     prior to the Effective Time.
 
          (c) Consents Obtained. All consents, waivers, approvals,
     authorizations or orders required to be obtained, and all filings required
     to be made by the Company for the authorization, execution and delivery of
     this Agreement and the consummation by it of the transactions contemplated
     hereby shall have been obtained and made by the Company, except where the
     failure to obtain any consents, waivers, approvals, authorizations or
     orders required to be obtained or any filings required to be made would not
     have a Material Adverse Effect on the Company and the Company Subsidiaries,
     taken as a whole.
 
          (d) Opinion of Counsel. Seller shall have received from Godfrey &
     Kahn, S.C., or other independent counsel for the Company reasonably
     satisfactory to Seller, an opinion dated the Effective Time, in form and
     substance reasonably satisfactory to Seller, covering the matters set forth
     in Annex E hereto, which opinion shall be based on such assumptions and
     contain such qualifications and limitations as are appropriate and
     reasonably satisfactory to Seller.
 
          (e) Tax Opinion. An opinion of Godfrey & Kahn, S.C., independent
     counsel to the Company, to the effect that the Merger will be treated for
     federal income tax purposes as a reorganization within the meaning of
     Section 368(a) of the Code, that the Company and Seller will each be a
     party to that reorganization within the meaning of Section 368(b) of the
     Code, and covering such related matters as reasonably required by Seller,
     dated on or about the date that is two business days prior to the date the
     Joint Proxy Statement is first mailed to shareholders of Seller and the
     Company, and such opinion shall have been delivered and shall not have been
     withdrawn or modified in any material respect.
 
          (f) Stock Exchange Listing. The shares of Company Common Stock to be
     issued in the Merger or pursuant to options to be granted in connection
     therewith shall have been approved for listing, upon notice of issuance, on
     the NASDAQ/NMS.
 
          (g) Opinion of Financial Adviser. Seller shall have received from
     Keefe, Bruyette & Woods, Inc. a written opinion to the effect that, as of
     the effective date of the Registration Statement, the consideration to be
     received in the Merger by Seller's shareholders was fair to Seller's
     shareholders from a financial point of view, together with a written
     consent of Keefe, Bruyette & Woods, Inc. consenting to the inclusion of
     said opinion and references thereto in the Joint Proxy Statement.
 
          (h) Pooling Opinions. Seller shall have received an opinion from
     Arthur Andersen & Co. to the effect that the Merger qualifies for
     pooling-of-interests accounting treatment if consummated in accordance with
     this Agreement.
 
               ARTICLE VIII -- TERMINATION, AMENDMENT AND WAIVER
 
     SECTION 8.1 TERMINATION.
 
          (a) This Agreement may be terminated at any time prior to the
     Effective Time, whether before or after approval of the matters presented
     in connection with the Merger by the shareholders of Seller or the Company:
 
             (i) by mutual consent of the Company and Seller;
 
             (ii) by Seller or the Company (A) if there has been a breach in any
        material respect (except that where any statement in a representation or
        warranty expressly includes a standard of materiality, such statement
        shall have been breached in any respect) of any representation,
        warranty, covenant or agreement on the part of Seller, on the one hand,
        or the Company, on the other hand, respectively, set forth in this
        Agreement, or (B) if any representation or warranty of Seller, on the
        one hand, or the Company, on the other hand, respectively, shall be
        discovered to have become untrue in any material respect (except that
        where any statement in a representation or warranty expressly includes a
        standard of materiality, such statement shall have become untrue in any
        respect), in either case
 
                                      A-33
<PAGE>   116
 
        which breach or other condition has not been cured within 30 business
        days following receipt by the non-terminating party of notice of such
        breach or other condition; provided, however, this Agreement may not be
        terminated pursuant to this clause (ii) by the breaching party or party
        making any representation or warranty which shall have become untrue in
        any material respect;
 
             (iii) by either the Company or Seller if any permanent injunction
        preventing the consummation of the Merger shall have become final and
        nonappealable;
 
             (iv) by either the Company or Seller if the Merger shall not have
        been consummated on or prior to one year from the date of this
        Agreement, for a reason other than the failure of the party seeking
        termination to comply with its obligations under this Agreement;
        provided that if the Merger shall not have been consummated on or prior
        to one year from the date of this Agreement as a result of proceedings
        of a governmental authority or litigation then the date on which either
        the Company or the Seller may terminate this Agreement under this
        Section 8.1(a)(iv) shall be extended to the earlier of (A) the lapse of
        a reasonable period of time necessary to consummate the Merger following
        the final termination of proceedings of a governmental authority or
        litigation or (B) December 31, 1994;
 
             (v) by either the Company or Seller if the Federal Reserve Board
        has denied approval of the Merger, and neither the Company nor Seller
        has, within 30 days after the entry of such order denying approval,
        filed a petition seeking review of such order as provided by applicable
        law;
 
             (vi) by either the Company or Seller pursuant to Section 8.2
        herein;
 
             (vii) by Seller, during the 10-day period commencing on the day the
        Federal Reserve Board issues an order approving consummation of the
        Merger (the "Fed Approval Date"), if both of the conditions in (A) and
        (B) below exist:
 
                (A) the average of the daily closing prices of a share of
           Company Common Stock as reported on the NASDAQ/NMS during the period
           of 10 trading days ending at the close of the third trading day
           immediately preceding the Fed Approval Date (the "Company Average
           Price") is less than $18; and
 
                (B) the number obtained by dividing the Company Average Price by
           the closing price of Company Common Stock as reported on the
           NASDAQ/NMS on September 17, 1993 is less than the number obtained by
           dividing the Final Index Price (as defined below) by the Initial
           Index Price (as defined below) and subtracting .15 from such
           quotient.
 
                (C) For purposes of this Section 8.1(a)(vii):
 
                    (1) The "Index Group" shall mean all of those companies
               listed on Exhibit 8.1 the common stock of which is publicly
               traded and as to which there is no pending publicly announced
               proposal at any time during the period of 10 trading days ending
               at the end of the third trading day immediately preceding the Fed
               Approval Date for such company to be acquired or with respect to
               any other extraordinary transaction or event (other than an
               acquisition by such company or any transaction contemplated in
               Section 8.1(a)(vii)(C)(4));
 
                    (2) The "Initial Index Price" shall mean the average of the
               per share closing prices of the common stock of the companies
               comprising the Index Group (weighted in accordance with the
               weighting factor set forth on Exhibit 8.1), as reported on the
               consolidated transactions reporting system for the market or
               exchange on which such common stock is principally traded, on
               September 17, 1993;
 
                   (3) The "Final Price" of any company belonging to the Index
                 Group shall mean the average of the daily closing sale prices
                 of a share of common stock of such company, as reported in the
                 consolidated transaction reporting system for the market or
                 exchange on
 
                                      A-34
<PAGE>   117
 
                 which such common stock is principally traded, during the
                 period of 10 trading days ending at the end of third trading
                 day immediately preceding the Fed Approval Date;
 
                    (4) The "Final Index Price" shall mean the average of the
               Final Prices for all of the companies comprising the Index Group
               weighted in the same manner. If the Company or any company
               belonging to the Index Group declares a stock dividend or effects
               a reclassification, recapitalization, split-up, combination,
               exchange of shares or similar transaction between the date of
               this Agreement and the Fed Approval Date, the closing prices for
               the common stock of such company shall be appropriately adjusted
               for the purposes of the definitions above so as to be comparable
               to the closing price on the date of this Agreement.
 
     SECTION 8.2 INVESTIGATION AND REVIEW. At any time prior to the 60th day
following the date of this Agreement, either the Company or Seller may elect to
terminate this Agreement as a result of any information obtained in the course
of the investigations or reviews of either the Company or Seller, as the case
may be, or information set forth in the Seller Disclosure Schedule or the
Company Disclosure Schedule, as the case may be, which either is (i) believed in
good faith by the Company or Seller, as the case may be, to be inconsistent in
any material respect with any of the representations and warranties of the
Seller or the Company, as the case may be, contained in this Agreement (except
that where any representation or warranty expressly includes a standard of
materiality, such information is inconsistent in any respect with the
representations and warranties contained in this Agreement), or (ii) in the good
faith opinion of either of their Boards of Directors, had or is reasonably
likely to have (A) a Material Adverse Effect on the Company and the Company
Subsidiaries, taken as a whole, or Seller and the Seller Subsidiaries, taken as
a whole, as the case may be or (B) a materially adverse impact on the expected
economic or business benefits of the transactions contemplated in this
Agreement. Notwithstanding the foregoing, either the Company or Seller may
pursuant to a written instrument signed by it (which shall not be deemed to be
an amendment or modification to this Agreement) terminate its right to terminate
this Agreement pursuant to this Section 8.2. Nothing in this Section shall be
construed (i) to limit the period of time during which the Company or Seller may
conduct its investigation and review of Seller or the Company, as the case may
be, (ii) to limit any duty of Seller or the Company to cooperate with the
investigation and review by the Company or Seller, as the case may be, prior or
subsequent to the period established pursuant to the first sentence of this
Section, or (iii) to limit or qualify in any respect the representations and
warranties or covenants of either the Company or Seller, as the case may be, all
as set forth in this Agreement.
 
     SECTION 8.3 EFFECT OF TERMINATION. In the event of the termination of this
Agreement pursuant to Section 8.1, this Agreement shall forthwith become void
and all rights and obligations of any party hereto shall cease except: (i) as
set forth in Section 9.1 of this Agreement and (ii) nothing herein shall relieve
any party from liability for any willful breach of this Agreement or shall
restrict either party's rights in the case thereof.
 
     SECTION 8.4 AMENDMENT. This Agreement may be amended by the parties hereto
by action taken by or on behalf of their respective Boards of Directors at any
time prior to the Effective Time; provided, however, that, after approval of the
Merger by the shareholders of Seller, no amendment may be made which would
reduce the amount or change the type of consideration into which each Share
shall be converted pursuant to this Agreement upon consummation of the Merger.
This Agreement may not be amended except by an instrument in writing signed by
the parties hereto.
 
     SECTION 8.5 WAIVER. At any time prior to the Effective Time, any party
hereto may (a) extend the time for the performance of any of the obligations or
other acts of the other party hereto, (b) waive any inaccuracies in the
representations and warranties contained herein or in any document delivered
pursuant hereto and (c) waive compliance with any of the agreements or
conditions contained herein. Any such extension or waiver shall be valid if set
forth in an instrument in writing signed by the party or parties to bound
thereby.
 
                                      A-35
<PAGE>   118
 
                        ARTICLE IX -- GENERAL PROVISIONS
 
     SECTION 9.1 NON-SURVIVAL OF REPRESENTATIONS, WARRANTIES AND AGREEMENTS. The
representations, warranties and agreements in this Agreement shall terminate at
the Effective Time or upon the termination of this Agreement pursuant to Article
VIII, except that the agreements set forth in Article I and Sections 6.4 and 6.5
shall survive the Effective Time indefinitely and those set forth in Sections
4.4(b), 4.7, 5.3(b), 8.3 and Article IX hereof shall survive termination
indefinitely.
 
     SECTION 9.2 NOTICES. All notices and other communications given or made
pursuant hereto shall be in writing and shall be deemed to have been duly given
or made as of the date delivered or mailed if delivered personally, or
telecopied with confirmation of receipt, and as of the second business day
following the date of deposit in the United States mail if mailed by registered
or certified mail (postage prepaid, return receipt requested) to the parties at
the following addresses (or at such other address for a party as shall be
specified by like changes of address) and shall be effective upon receipt:
 
        (a) If to the Company:
 
            Marshall & Ilsley Corporation
            770 North Water Street
            Milwaukee, WI 53202
            Telecopier: (414) 764-7788
            Attention: Gordon H. Gunnlaugsson
 
            With a copy to:
 
            Godfrey & Kahn, S.C.
            780 North Water Street
            Milwaukee, WI 53202
            Telecopier: (414) 273-5198
            Attention: Kenneth C. Hunt
 
        (b) If to Seller:
 
            Valley Bancorporation
            100 West Lawrence Street
            P.O. Box 1061
            Appleton, WI 54912-1061
            Telecopier: (414) 738-5120
            Attention: Peter M. Platten III
 
            With a copy to:
 
            Quarles & Brady
            411 East Wisconsin Avenue
            Milwaukee, WI 53202
            Telecopier: (414) 271-3552
            Attention: Bruce C. Davidson
 
     SECTION 9.3 CERTAIN DEFINITIONS. For purposes of this Agreement, the term:
 
          (a) "affiliate" means a person that directly or indirectly, through
     one or more intermediaries, controls, is controlled by, or is under common
     control with, the first mentioned person; including, without limitation,
     any partnership or joint venture in which any person (either alone, or
     through or together with any other subsidiary) has, directly or indirectly,
     an interest of 5% or more;
 
          (b) "beneficial owner," with respect to any Shares, means a person who
     shall be deemed to be the beneficial owner of such Shares (i) which such
     person or any of its affiliates or associates (as such terms are defined in
     Rule 12b-2 of the Exchange Act) beneficially owns, directly or indirectly,
     (ii) which such person or any of its affiliates or associates has, directly
     or indirectly, (A) the right to acquire (whether
 
                                      A-36
<PAGE>   119
 
     such right is exercisable immediately or subject only to the passage of
     time), pursuant to any agreement, arrangement or understanding or upon the
     exercise of consideration rights, exchange rights, warrants or options, or
     otherwise, or (B) the right to vote pursuant to any agreement, arrangement
     or understanding, (iii) which are beneficially owned, directly or
     indirectly, by any other persons with whom such person or any of its
     affiliates or associates has any agreement, arrangement or understanding
     for the purpose of acquiring, holding, voting or disposing of any Shares or
     (iv) pursuant to Section 13(d) of the Exchange Act and any rules or
     regulations promulgated thereunder;
 
          (c) "business day" means any day other than a day on which banks in
     Wisconsin are required or authorized to be closed;
 
          (d) "control" (including the terms "controlled by" and "under common
     control with") means the possession, directly or indirectly or as trustee
     or executor, of the power to direct or cause the direction of the
     management or policies of a person, whether through the ownership of stock
     or as trustee or executor, by contract or credit arrangement or otherwise;
 
          (e) "person" means an individual, corporation, partnership,
     association, trust, unincorporated organization, other entity or group (as
     defined in Section 13(d) of the Exchange Act); and
 
          (f) "subsidiary" or "subsidiaries" of the Seller, the Company, the
     Surviving Corporation, or any other person, means any corporation,
     partnership, joint venture or other legal entity of which Seller, the
     Company, the Surviving Corporation or such other person, as the case may be
     (either alone or through or together with any other subsidiary), owns,
     directly or indirectly, 50% or more of the stock or other equity interests
     the holders of which are generally entitled to vote for the election of the
     board of directors or other governing body of such corporation or other
     legal entity.
 
     SECTION 9.4 HEADINGS. The headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.
 
     SECTION 9.5 SEVERABILITY. If any term or other provision of this Agreement
is invalid, illegal or incapable of being enforced by any rule of law or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in full force and effect so long as the economic or legal substance of
the transactions contemplated hereby is not affected in any manner adverse to
any party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the
parties as closely as possible in an acceptable manner to the end that
transactions contemplated hereby are fulfilled to the extent possible.
 
     SECTION 9.6 ENTIRE AGREEMENT. This Agreement, the Stock Option Agreement
and the confidentiality agreements in effect between the parties on the date of
this Agreement constitute the entire agreement of the parties and supersede all
prior agreements and undertakings, both written and oral, between the parties,
or any of them, with respect to the subject matter hereof and, except as
otherwise expressly provided herein, are not intended to confer upon any other
person any rights or remedies hereunder.
 
     SECTION 9.7 ASSIGNMENT. This Agreement and the Stock Option Agreement shall
not be assigned by operation of law or otherwise, except that the Company may
assign all or any of its rights hereunder and thereunder to any affiliate
provided that no such assignment shall relieve the assigning party of its
obligations hereunder.
 
     SECTION 9.8 PARTIES IN INTEREST. This Agreement (including Annex C hereto)
shall be binding upon and inure solely to the benefit of each party hereto, and
nothing in this Agreement, express or implied, is intended to or shall confer
upon any other person any right, benefit or remedy of any nature whatsoever
under or by reason of this Agreement, other than Section 6.5 (which is intended
to be for the benefit of the Indemnified Parties and may be enforced by such
Indemnified Parties).
 
     SECTION 9.9 GOVERNING LAW. This Agreement shall be governed by, and
construed in accordance with, the laws of the State of Wisconsin, regardless of
the laws that might otherwise govern under applicable principles of conflicts of
law.
 
                                      A-37
<PAGE>   120
 
     SECTION 9.10 COUNTERPARTS. This Agreement may be executed in one or more
counterparts, and by the different parties hereto in separate counterparts, each
of which when executed shall be deemed to be an original but all of which taken
together shall constitute one and the same agreement.
 
     SECTION 9.11 DISCLOSURE SCHEDULES. All capitalized terms used in the Seller
and Company Disclosure Schedules shall have the definitions specified in this
Agreement. All descriptions or listing of documents contained in those
Disclosure Schedules are qualified in their entirety by reference to the
documents so described, true copies of which have heretofore been delivered or
made available to the Seller or the Company, as the case may be. Disclosure of a
matter or document in either the Seller Disclosure Schedule or the Company
Disclosure Schedule shall not be deemed to be an acknowledgement that such
matter is material or outside the ordinary course of business of the Seller or
the Company, as the case may be.
 
     IN WITNESS WHEREOF, the Company and Seller have caused this Agreement to be
executed as of the date first written above by their respective officers
thereunto duly authorized.
 
                                          VALLEY BANCORPORATION
 
                                          By: /S/ PETER M. PLATTEN, III
                                              Peter M. Platten, III
                                              President and Chief
                                              Executive Officer
 
                                          MARSHALL & ILSLEY CORPORATION
 
                                          By: /S/ J.B. WIGDALE
                                              J. B. Wigdale
                                              Chairman of the Board
                                              and Chief Executive
                                              Officer
 
                                      A-38
<PAGE>   121
 
                                                                         ANNEX A
 
         ADDITIONAL DIRECTORS AND OFFICERS OF THE SURVIVING CORPORATION
 
     The following persons shall be appointed directors and/or officers of the
Surviving Corporation at the Effective Time:
 
<TABLE>
<CAPTION>
            ADDITIONAL DIRECTORS                                CLASS
- ---------------------------------------------   --------------------------------------
<S>                                             <C>
Peter M. Platten III.........................   Class I (term expiring April, 1997)
Oscar C. Boldt...............................   Class III (term expiring April, 1996)
Gus A. Zuehlke...............................   Class III (term expiring April, 1996)
A member of Seller's Board of Directors to be   Class II (term expiring April, 1995)
  determined by agreement of Seller and the
  Company....................................
</TABLE>
 
<TABLE>
<CAPTION>
             ADDITIONAL OFFICERS                               POSITION
- ---------------------------------------------   --------------------------------------
<S>                                             <C>
Peter M. Platten III.........................   Vice Chairman of the Board
Mark Miller..................................   Senior Vice President
Gary Lichtenberg.............................   Senior Vice President
Charles Sauter...............................   Senior Vice President
Sal Troia....................................   Senior Vice President
</TABLE>
 
                                      A-39
<PAGE>   122
 
                                    ANNEX C
 
         EMPLOYEE AND DIRECTOR STOCK OPTIONS AND OTHER BENEFIT MATTERS
 
     1. ADJUSTMENT OF OPTIONS.
 
          (a) At the Effective Time, the Company will assume the option plans
     listed on Exhibit A of this Annex C (the "Option Plans") and all of the
     Seller's obligations thereunder. At the Effective Time, each outstanding
     option issued pursuant to the Option Plans shall be deemed to constitute an
     option to acquire, on the same terms and conditions as were applicable
     under such Option (including, without limitation, the time periods allowed
     for exercise), a number of Company Common Shares equal to the product of
     the Exchange Rate and the number of shares subject to such Option, at a
     price per share equal to the aggregate exercise price for the Shares
     subject to such option divided by the number of Company Common Shares
     purchasable pursuant to such assumed Option.
 
          (b) The Company shall take all corporate action necessary to reserve
     for issuance a sufficient number of Company Common Shares for delivery upon
     exercise of the Options adjusted in accordance with this Section 1 of this
     Annex C. The Company shall file one or more registration statements on Form
     S-8 (or any successor form) or another appropriate form, effective as of
     the Effective Time, with respect to the Company Common Stock subject to
     such Options and shall use its best efforts to maintain the effectiveness
     of such registration statement or registration statements (and maintain the
     current status of the related prospectus or prospectuses) for so long as
     such Options remain outstanding. With respect to those individuals who
     subsequent to the Merger will be subject to the reporting requirements
     under Section 16(a) of the Exchange Act, the Company shall administer the
     Option Plans assumed pursuant to this Section 1 of this Annex C in a manner
     that complies with Rule 16b-3 promulgated under the Exchange Act to the
     extent the Option Plans complied with such rule prior to the Merger.
 
     2. NOTICE OF NO EXTENSION OF CONTRACT TERM. At the request of the Company,
Seller will give timely notice to an affected employee as required under his
employment agreement that Seller does not wish to extend the contract beyond its
current term.
 
     3. OTHER EMPLOYEE BENEFITS IN GENERAL. It is the current intention of the
Company to provide continuing employees of Seller and its subsidiaries with
retirement and welfare benefits which are comparable to those provided to other
similarly situated employees of the Company and its subsidiaries. Continuing
Employees of Seller and its subsidiaries will have their years of service with
Seller and its subsidiaries generally recognized for employee benefit purposes
of the Company, subject to the special rules set forth in Section 7, below.
 
     4. GROUP TERM LIFE INSURANCE. The total coverage under the Company's group
term life insurance program for any employee who is provided a life insurance
policy under the Seller's Executive Life Insurance Plan will be reduced by the
amount of coverage provided by such policy.
 
     5. SELLER'S PENSION PLANS. As of the Effective Time, Seller's Pension Plan
and Excess Benefits Pension Plan (jointly the "Pension Plans") shall be frozen
and accruals for purposes of determining benefit service and eligibility service
under the Pension Plans shall cease. However, service with the Company after the
Effective Time shall be credited for purposes of determining vesting service
under the Pension Plans.
 
     6. THRIFT AND SHARING PLANS. Seller shall terminate the non-qualified
Thrift and Sharing Plan prior to the Effective Time in accordance with its
terms. Company and Seller shall cooperate so that Seller's qualified 401(k)
Thrift and Sharing Plan shall be merged into the qualified M & I Incentive
Savings Plan on or as soon as practicable after the Effective Time. Employer
matching contributions under both such Plans shall be determined in accordance
with the formulae expressed in such Plans, if any, on an annualized basis, and
then prorated to take into account the short plan year up to the Effective Time.
Distributions from the terminated non-qualified Thrift and Sharing Plan shall be
made as soon as practicable following its termination.
 
     7. POST-MERGER HEALTH CARE BENEFIT RIGHTS TO VALLEY BANCORPORATION RETIREES
AND PROSPECTIVE M&I RETIREES WHO PARTICIPATED IN THE VALLEY BANCORPORATION
HEALTH PLAN.
 
          (a) The Valley Bancorporation Health Plan will be terminated at the
     Effective Time.
 
                                      A-40
<PAGE>   123
 
          (b) Eligibility of former Valley Bancorporation employees and their
     spouses and dependents participating in the Valley Bancorporation Health
     Plan as of the Effective Time to participate in the M&I Health Plans will
     be determined as follows:
 
             (i) The eligibility requirements of the M&I Health Plans will
        govern effective at the Effective Time.
 
             (ii) Retired Valley Bancorporation employees participating in the
        Valley Bancorporation Health Plan as of the Effective Time will receive
        credit for years of service and years of participation under the Valley
        Bancorporation Health Plan for purposes of the M&I Health Plans and,
        accordingly, will be immediately eligible for participation in the M&I
        Health Plans at the rate of contribution under the Valley Bancorporation
        Health Plan in effect at the Effective Time. Spouses and dependents of
        such retirees will be treated similarly.
 
             (iii) Employees' years of service and participation under the
        Valley Bancorporation Health Plan shall be credited toward the service
        and participation requirements of the M&I Health Plans for retirements
        on or before December 31, 1994. Accordingly, former Valley
        Bancorporation employees who (a) retire from M&I on or before December
        31, 1994; (b) are 55 years or older as of their retirement date; and (c)
        have ten or more years of both service and participation in either or
        both the Valley Bancorporation or M&I Health Plans will be permitted to
        participate in the M&I Health Plans and will receive premium subsidies
        at the rate of contribution under the Valley Bancorporation Health Plan
        for retirees in effect at the Effective Time.
 
             (iv) Former Valley Bancorporation employees who retire from M&I
        before December 31, 1994, and who are less than 55 years old at the time
        of their retirement will be ineligible for retiree coverage under the
        M&I Health Plans.
 
             (v) Former Valley Bancorporation employees who retire from M&I
        before December 31, 1994, and who are 55 years or older, but who have
        less than ten years of service and participation under either or both
        the Valley Bancorporation or M&I Health Plans at the time of their
        retirement will be ineligible for retiree coverage under the M&I Health
        Plans.
 
             (vi) Former Valley Bancorporation employees retiring from M&I after
        December 31, 1994, who (a) are 55 years old or older at the time of
        their retirement and (b) have ten or more years of participation in the
        M&I Health Plans will be eligible for health benefits in accordance with
        the M&I Health Plans' terms. Such individuals will receive credit for
        purposes of the M&I Health Plans for years of participation in the
        Valley Bancorporation Health Plan; provided, however, that such
        individuals will not receive any subsidy for such coverage absent ten
        years of service and participation in the M&I Health Plans (excluding
        any Valley Bancorporation service and/or Health Plan participation).
 
                                      A-41
<PAGE>   124
 
                                                            EXHIBIT A TO ANNEX C
 
                SELLER OPTION PLANS TO BE ASSUMED BY THE COMPANY
 
     1984 Incentive Stock Option Plan
 
     1986 Amended and Restated Stock Option Plan
 
     1988 Nonqualified Stock Option Plan
 
     1992 Incentive Stock Plan
 
     1992 Outside Directors' Stock Option Plan
 
     Incentive Stock Option Plans of Community Bank, Inc., as amended, assumed
by Seller.
 
                                      A-42
<PAGE>   125
 
                                                                         ANNEX D
 
                      FORM OF OPINION OF COUNSEL TO SELLER
 
     (i) Seller is a corporation duly incorporated, validly existing and in
active status (meaning it has filed its annual report for its most recently
completed report year and has not filed articles of dissolution) under the laws
of the State of Wisconsin, and has the requisite corporate power and authority
to carry on its business as now being conducted.
 
     (ii) Seller has the requisite corporate power and authority to execute and
deliver the Agreement and the Stock Option Agreement and to perform its
obligations thereunder and to consummate the transactions contemplated thereby.
 
     (iii) The execution and delivery of the Agreement and the Stock Option
Agreement by Seller and the consummation by Seller of the transactions
contemplated thereby have been duly and validly authorized by all necessary
corporate action on the part of Seller.
 
     (iv) The Agreement and the Stock Option Agreement have been duly and
validly executed and delivered by Seller and, assuming the due execution and
delivery thereof by the Company, each constitutes the legal, valid and binding
obligation of Seller, enforceable against Seller in accordance with its
respective terms, (a) except as such enforceability may be subject to the effect
of any applicable bankruptcy, insolvency (including, without limitation, all
laws relating to fraudulent transfers), reorganization, moratorium or similar
law affecting creditors' rights generally and to the effect of general
principles of equity, including, without limitation, concepts of materiality,
reasonableness, good faith and fair dealing (regardless of whether considered in
a proceeding in equity or at law) and (b) except as the enforceability of any
indemnity provision may be limited by federal or state securities laws or the
public policy underlying such laws or may otherwise be limited by applicable
provisions of the WBCL.
 
     (v) The execution and delivery of the Agreement and the Stock Option
Agreement by Seller do not, and the performance of the Agreement and the Stock
Option Agreement by Seller shall not, conflict with or violate (a) the Seller
Articles or Seller By-Laws or (b) any material federal or Wisconsin state or
local law, statute, ordinance, rule, regulation, order, judgment or decree
applicable to Seller or by which any of its properties is bound or affected.
 
     (vi) The Joint Proxy Statement (excluding the financial statements and
other financial and statistical information included or incorporated therein or
omitted therefrom, and all information about, or supplied or omitted by, the
Company for use in the Joint Proxy Statement, as to all of which we do not
express any opinion), at the time it was first mailed to holders of Seller
Common Stock and at the date of the Seller Shareholders Meeting, complied as to
form in all material respects with the requirements of the Exchange Act and the
rules and regulations of the SEC thereunder.
 
     We have participated in the preparation and filing of the Joint Proxy
Statement and the Registration Statement and, in the course of such preparation,
in conferences with certain officers and employees of Seller with respect
thereto. Although we are not passing upon or assuming any responsibility for the
accuracy, completeness or fairness of the statements contained or incorporated
in the Joint Proxy Statement or the Registration Statement, during the course of
such participation no facts have come to our attention which would lead us to
believe that the Joint Proxy Statement, at the time it was first mailed to
holders of Seller Common Stock and at the time of the Seller Shareholders
Meeting, contained any untrue statement of a material fact or omitted to state
any material fact required to be stated therein or necessary in order to make
the statements therein, in the light of the circumstances under which they were
made, not misleading, or that the Registration Statement at the time it became
effective and at the Effective Time, contained any untrue statement of a
material fact or omitted to state any material fact required to be stated
therein or necessary to make the statements therein not misleading (except that
we do not comment with respect to the financial statements and other financial
and statistical information included or incorporated therein or omitted
therefrom, or any information about, or supplied or omitted by, the Company for
use in the Joint Proxy Statement or the Registration Statement).
 
                                      A-43
<PAGE>   126
 
     (vii) No Seller Right is or will become, as a result of this Agreement, the
Stock Option Agreement or the transactions contemplated therein, exercisable,
and no Seller Right will attach to (A) any outstanding Company Common Stock, (B)
the Company Common Stock issued in connection with the Merger, or (C) any
Company Common Stock issued subsequent to the Merger.
 
                                      A-44
<PAGE>   127
 
                                                                         ANNEX E
                     FORM OF OPINION OF COUNSEL TO COMPANY
 
     (i) The Company is a corporation duly incorporated, validly existing and in
active status (meaning it has filed its annual report for its most recently
completed report year and has not filed articles of dissolution) under the laws
of the State of Wisconsin, and has the requisite corporate power and authority
to carry on its business as now being conducted.
 
     (ii) The Company has the requisite corporate power and authority to execute
and deliver the Agreement and the Stock Option Agreement and to perform its
obligations thereunder and to consummate the transactions contemplated thereby.
 
     (iii) The execution and delivery of the Agreement and the Stock Option
Agreement by the Company and the consummation by the Company of the transactions
contemplated thereby have been duly and validly authorized by all necessary
corporate action on the part of the Company.
 
     (iv) The Agreement has been duly and validly executed and delivered by the
Company and, assuming the due execution and delivery thereof by Seller,
constitutes a legal, valid and binding obligation of the Company, enforceable
against the Company in accordance with its terms, (a) except as such
enforceability may be subject to the effect of any applicable bankruptcy,
insolvency (including, without limitation, all laws relating to fraudulent
transfers), reorganization, moratorium or similar law affecting creditors'
rights generally and to the effect of general principles of equity, including,
without limitation, concepts of materiality, reasonableness, good faith and fair
dealing (regardless of whether considered in a proceeding in equity or at law)
and (b) except as the enforceability of the indemnity provision may be limited
by federal or state securities laws or the public policy underlying such laws or
may otherwise be limited by applicable provisions of the WBCL.
 
     (v) The shares of Company Common Stock to be delivered in exchange for the
outstanding shares of Seller Common Stock, as set forth in the Agreement, are
duly authorized and, when issued as contemplated by the Agreement, will be
validly issued, fully paid and nonassessable (except as otherwise provided in
Section 180.0622(2)(b) of the WBCL).
 
     (vi) The execution and delivery of the Agreement by the Company do not, and
the performance of the Agreement by the Company shall not, conflict with or
violate (a) the Company Articles or Company By-Laws or (b) any material federal
or Wisconsin state or local law, statute, ordinance, rule, regulation, order,
judgment or decree applicable to the Company or by which any of its properties
is bound or affected.
 
     (vii) The Registration Statement has become effective under the Securities
Act and, to the best of our knowledge, no stop order suspending the
effectiveness of the Registration Statement has been issued and no proceedings
for that purpose have been instituted or are pending under the Securities Act.
 
     (viii) The Registration Statement as of the effective date thereof
(excluding the financial statements and other financial and statistical
information included or incorporated therein or omitted therefrom, and all
information about, or supplied or omitted by, Seller for use in the Registration
Statement, as to all of which we do not express any opinion) complied as to form
in all material respects with the requirements of the Securities Act and the
rules and regulations thereunder.
 
     (ix) The Joint Proxy Statement (excluding the financial statements and
other financial and statistical information included or incorporated therein or
omitted therefrom, and all information about, or supplied or omitted by, Seller
for use in the Joint Proxy Statement, as to all of which we do not express any
opinion), at the time it was first mailed to holders of the Company Common Stock
and at the date of the Company Shareholders Meeting, complied as to form in all
material respects with the requirements of the Exchange Act and the rules and
regulations thereunder.
 
     We have participated in the preparation and filing of the Joint Proxy
Statement and the Registration Statement and, in the course of such preparation,
in conferences with certain officers and employees of the Company with respect
thereto. Although we are not passing upon or assuming any responsibility for the
 
                                      A-45
<PAGE>   128
 
accuracy, completeness or fairness of the statements contained or incorporated
in the Joint Proxy Statement or the Registration Statement, during the course of
such participation no facts have come to our attention which would lead us to
believe that the Joint Proxy Statement, at the time it was first mailed to
holders of Company Common Stock and at the time of the Company Shareholders
Meeting, contained any untrue statement of a material fact or omitted to state
any material fact required to be stated therein or necessary in order to make
the statements therein, in the light of the circumstances under which they were
made, not misleading, or that the Registration Statement at the time it became
effective and at the Effective Time, contained any untrue statement of a
material fact or omitted to state any material fact required to be stated
therein or necessary to make the statements therein not misleading (except that
we do not comment with respect to the financial statements and other financial
and statistical information included or incorporated therein or omitted
therefrom, or any information about, or supplied or omitted by, Seller for use
in the Joint Proxy Statement or the Registration Statement).
 
                                      A-46
<PAGE>   129
 
                                                                     EXHIBIT 4.6
 
                                AFFILIATE LETTER
 
Gentlemen:
 
     I have been advised that as of the date of this letter I may be deemed to
be an "affiliate" of Valley Bancorporation, a Wisconsin corporation ("Seller"),
as the term "affiliate" is (i) defined for purposes of paragraphs (c) and (d) of
Rule 145 of the Rules and Regulations (the "Rules and Regulations") of the
Securities and Exchange Commission (the "Commission") under the Securities Act
of 1933, as amended (the "Act"), and/or (ii) used in and for purposes of
Accounting Series, Releases 130 and 135, as amended, of the Commission. Pursuant
to the terms of the Agreement and Plan of Merger dated as of September 19, 1993
(the "Agreement"), among Marshall & Ilsley Corporation, a Wisconsin corporation
("the Company"), and Seller, Seller will be merged with and into the Company
(the "Merger").
 
     As a result of the Merger, I may receive shares of Company Common Stock,
par value $1.00 per share (the "Company Securities"). I would receive such
shares in exchange for shares owned by me of Seller Common Stock, par value
$0.50 per share (the "Seller Securities").
 
     I represent, warrant and covenant to Company that in the event I receive
any Company Securities as a result of the Merger:
 
          A. I shall not make any sale, transfer or other disposition of the
     Company Securities in violation of the Act or the Rules and Regulations.
 
          B. I have carefully read this letter and the Agreement and discussed
     its requirements and other applicable limitations upon my ability to sell,
     transfer or otherwise dispose of Company Securities to the extent I felt
     necessary, with my counsel or counsel for Seller.
 
          C. I have been advised that the issuance of Company Securities to me
     pursuant to the Merger has been registered with the Commission under the
     Act on a Registration Statement on Form S-4. However, I have also been
     advised that, since at the time the Merger was submitted for a vote of the
     stockholders of Seller, I may be deemed to have been an affiliate of
     Seller, and since the distribution by me of the Company Securities has not
     been registered under the Act, and that I may not sell, transfer or
     otherwise dispose of Company Securities issued to me in the Merger unless
     (i) such sale, transfer or other disposition has been registered under the
     Act, (ii) such sale, transfer or other disposition is made in conformity
     with the volume and other limitations of Rule 145 promulgated by the
     Commission under the Act, or (iii) in the opinion of counsel reasonably
     acceptable to the Company, such sale, transfer or other disposition is
     otherwise exempt from registration under the Act.
 
          D. I understand that the Company is under no obligation to register
     the sale, transfer or other disposition of the Company Securities by me or
     on my behalf under the Act or to take any other action necessary in order
     to make compliance with an exemption from such registration available.
 
          E. I also understand that stop transfer instructions will be given to
     the Company's transfer agents with respect to the Company Securities and
     that there will be placed on the certificates for the Company Securities
     issued to me, or any substitutions therefor, a legend stating in substance:
 
        "THE SHARES REPRESENTED BY THIS CERTIFICATE WERE ISSUED IN A TRANSACTION
        TO WHICH RULE 145 PROMULGATED UNDER THE SECURITIES ACT OF 1933 APPLIES.
        THE SHARES REPRESENTED BY THIS CERTIFICATE MAY ONLY BE TRANSFERRED IN
        ACCORDANCE WITH THE TERMS OF AN AGREEMENT DATED
 
                                      A-47
<PAGE>   130
 
                         BETWEEN THE REGISTERED HOLDER HEREOF AND THE COMPANY, A
        COPY OF WHICH AGREEMENT IS ON FILE AT THE PRINCIPAL OFFICES OF THE
        COMPANY."
 
          F. I also understand that unless the transfer by me of my Company
     Securities has been registered under the Act or is a sale made in
     conformity with the provisions of Rule 145, the Company reserves the right
     to put the following legend on the certificates issued to my transferee:
 
        "THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
        UNDER THE SECURITIES ACT OF 1933 AND WERE ACQUIRED FROM A PERSON WHO
        RECEIVED SUCH SHARES IN A TRANSACTION TO WHICH RULE 145 PROMULGATED
        UNDER THE SECURITIES ACT OF 1933 APPLIES. THE SHARES HAVE BEEN ACQUIRED
        BY THE HOLDER NOT WITH A VIEW TO, OR FOR RESALE IN CONNECTION WITH, ANY
        DISTRIBUTION THEREOF WITHIN THE MEANING OF SECURITIES ACT OF 1933 AND
        MAY NOT BE SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT IN ACCORDANCE
        WITH AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES
        ACT OF 1933."
 
     It is understood and agreed that the legends set forth in paragraphs E and
F above shall be removed by delivery of substitute certificates without such
legend as soon as the Rule 145 resale restrictions cease to apply thereto under
Rule 145(d), or if the undersigned shall have delivered to the Company a copy of
a letter from the staff of the Commission, or an opinion of counsel in form and
substance reasonably satisfactory to the Company, to the effect that such legend
is not required for purposes of the Act.
 
     I further represent to and covenant with the Company that I have not,
within the 30 days prior to the Effective Time (as defined in the Agreement),
sold, transferred or otherwise disposed of any shares of Seller Securities or
shares of the capital stock of the Company held by me and that I will not sell,
transfer or otherwise dispose of any shares of Company Securities received by me
in the Merger or other shares of the capital stock of the Company until after
such time as results covering at least 30 days of combined operations of Seller
and the Company have been published by the Company, in the form of a quarterly
earnings report, an effective registration statement filed with the Commission,
a report to the Commission on Form 10-K, 10-Q, or 8-K, or any other public
filing or announcement which includes the combined results of operations.
 
                                            Very truly yours,
                                                  __________________________
                                            Name: 
 
Accepted this   day of
           , 199 by
COMPANY
 
By: __________________________
Name:
Title:
 
                                      A-48
<PAGE>   131
 
                                                                     EXHIBIT 8.1
 
                    INDEX OF SELECTED BANK HOLDING COMPANIES
 
<TABLE>
<CAPTION>
                                                                                        % OF
                BANK                                                                   INDEX
                ----                                                                   ------
<S>                                                                                    <C>
AmSouth Bancorporation..............................................................    3.427%
Bancorp Hawaii, Inc. ...............................................................    2.938
Boatmen's Bancshares, Inc. .........................................................    7.696
Comerica Incorporated...............................................................    8.401
Fifth Third Bancorp ................................................................    7.912
First Bank System, Inc. ............................................................    8.814
First of America Bank Corporation...................................................    5.699
First Tennessee National Corporation................................................    2.851
Firstar Corporation.................................................................    5.346
Huntington Bancshares Incorporated .................................................    6.069
Mercantile Bancorporation Inc.......................................................    2.956
National City Corporation ..........................................................   10.518
Northern Trust Corporation..........................................................    5.458
Old Kent Financial Corporation .....................................................    3.528
Society Corp. ......................................................................    9.637
U.S. Bancorp........................................................................    6.428
West One Bancorp ...................................................................    2.322
                                                                                       ------
                                                                                       100.00%
                                                                                       ------
     Index Price....................................................................   $36.15
                                                                                       ------
                                                                                       ------
</TABLE>
 
                                      A-49
<PAGE>   132
 
                                                                      APPENDIX B
 
                             STOCK OPTION AGREEMENT
 
     STOCK OPTION AGREEMENT, dated as of September 19, 1993 (the "Agreement"),
by and between Valley Bancorporation, a Wisconsin corporation ("Seller"), and
Marshall & Ilsley Corporation, a Wisconsin corporation ("the Company");
 
     WHEREAS, Seller and the Company propose to enter into an Agreement and Plan
of Merger dated as of the date hereof (the "Merger Agreement"; capitalized terms
not defined herein shall have the meanings set forth in the Merger Agreement),
providing for, among other things, the merger of Seller with and into the
Company with the Company as the surviving corporation; and
 
     WHEREAS, as a condition and inducement to the Company's willingness to
enter into the Merger Agreement, the Company has required that Seller agree, and
Seller has agreed, to grant the Company the Option (as defined below);
 
     NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth herein and in
the Merger Agreement, Seller and the Company agree as follows:
 
          1. GRANT OF OPTION. Subject to the terms and conditions set forth
     herein, Seller hereby grants to the Company an irrevocable option (the
     "Option") to purchase up to 4,045,795 (as adjusted as set forth in Section
     6 hereof) shares (the "Option Shares") of common stock, par value $0.50 per
     share ("Seller Common Stock"), of Seller at a purchase price of $35.75 per
     Option Share (the "Purchase Price"); provided, however, that in no event
     shall the number of shares for which the Option is exercisable exceed 19.9%
     of the issued and outstanding shares of Seller Common Stock.
 
          2. EXERCISE OF OPTION. (a) If the Merger Agreement has not been
     terminated by Seller pursuant to Section 8.1(a)(ii) thereof, the Company
     may exercise the Option, in whole or in part, at any time and from time to
     time, if, but only if both a Triggering Event (as defined below) and an
     Exercise Event (as defined below) shall have occurred prior to the
     occurrence of an Exercise Termination Event (as defined below). Each of the
     following shall be an Exercise Termination Event: (i) the Effective Time,
     (ii) termination of the Merger Agreement in accordance with the provisions
     thereof if such termination occurs prior to the occurrence of a Triggering
     Event; or (iii) the passage of 12 months after termination of the Merger
     Agreement if such termination follows the occurrence of a Triggering Event,
     provided that if a Triggering Event continues or occurs beyond such
     termination, the Exercise Termination Event shall be 12 months from the
     expiration of the Last Triggering Event but in no event more than 18 months
     after such termination. The "Last Triggering Event" shall mean the last
     Triggering Event to occur. Any purchase of shares upon exercise of the
     Option shall be subject to compliance with applicable law, including the
     Bank Holding Company Act of 1956, as amended. The Company's rights under
     Section 7 shall not terminate upon expiration of the right to exercise the
     Option pursuant to this Section 2, but shall continue until such rights may
     otherwise terminate in accordance with the terms of Section 7. Any date the
     Company exercises its rights under Section 7 shall be referred to herein as
     an "Election Date." Notwithstanding the expiration of the Option, the
     Company shall be entitled to purchase those Option Shares with respect to
     which it has exercised the Option in accordance with the terms hereof prior
     to the occurrence of an Exercise Termination Event.
 
          (b) The term "Triggering Event" shall mean any of the following events
     or transactions occurring after the date hereof:
 
             (i) Seller or any of its Subsidiaries (each a "Seller Subsidiary"),
        without having received the Company's prior written consent, shall have
        entered into an agreement to engage in an Acquisition Transaction (as
        hereinafter defined) with any person (the term "person" for purposes of
        this Agreement have the meaning assigned thereto in Sections 3(a)(9) and
        13(d)(3) of the Exchange Act, and the rules and regulations thereunder)
        other than Company or any of its Subsidiaries (each a "Company
        Subsidiary") or the Board of Directors of Seller shall have recommended
        that the
 
                                       B-1
<PAGE>   133
 
        shareholders of Seller approve or accept any Acquisition Transaction
        other than as contemplated by the Merger Agreement. For purposes of this
        Agreement, "Acquisition Transaction" shall mean (x) a merger,
        consolidation, share exchange, or similar business combination
        transaction, involving Seller or any Significant Subsidiary (as defined
        in Rule 1-02 of Regulation S-X promulgated by the SEC) of Seller, (y) a
        purchase, lease or other acquisition of 10% or more of the assets of
        Seller or any Significant Subsidiary of Seller, or (z) a purchase or
        other acquisition (including by way of merger, consolidation, share
        exchange or otherwise) of securities representing 10% or more of the
        voting power of Seller or any Significant Subsidiary of Seller.
 
             (ii) Any person other than Company, any Company Subsidiary or any
        Seller Subsidiary acting in a fiduciary capacity shall have acquired
        beneficial ownership or the right to acquire beneficial ownership of, or
        commenced a tender offer or exchange offer for, 10% or more of the
        outstanding shares of Seller Common Stock (the term "beneficial
        ownership" for purposes of this Option Agreement having the meaning
        assigned thereto in Section 13(d) of the Exchange Act, and the rules and
        regulations thereunder);
 
             (iii) Any person other than Company or any Company Subsidiary shall
        have made a bona fide proposal to Seller or its shareholders by public
        announcement or written communication that is or becomes the subject of
        public disclosure to engage in an Acquisition Transaction;
 
             (iv) After a proposal is made by a third party to Seller or its
        shareholders to engage in an Acquisition Transaction, Seller shall have
        breached any covenant or obligation contained in the Merger Agreement
        and such breach (x) would entitle Company to terminate the Merger
        Agreement and (y) shall not have been cured prior to the Notice Date (as
        defined below); or
 
             (v) Any person other than Company or any Company Subsidiary, other
        than in connection with a transaction to which Company has given its
        prior written consent, shall have filed an application or notice with
        the Board of Governors of the Federal Reserve System (the "Federal
        Reserve Board") or the Federal Deposit Insurance Corporation ("FDIC") or
        other federal or state bank regulatory authority, which application or
        notice has been accepted for processing, for approval to engage in an
        Acquisition Transaction.
 
          (c) The term "Exercise Event" shall mean either of the following
     events or transactions occurring after the date hereof:
 
             (i) The acquisition by any person of beneficial ownership of 20% or
        more of the then outstanding Seller Common Stock; or
 
             (ii) The occurrence of the Triggering Event described in clause (i)
        of subsection (b) of this Section 2, except that the percentage referred
        to in clause (z) shall be 20%.
 
          (d) Seller shall notify Company promptly in writing of the occurrence
     of any Triggering Event or Exercise Event, it being understood that the
     giving of such notice by Seller shall not be a condition to the right of
     the Company to exercise the Option.
 
          (e) In the event the Company wishes to exercise the Option, it shall
     send to Seller a written notice (the date of which being herein referred to
     as the "Notice Date") specifying (i) the total number of Option Shares it
     intends to purchase pursuant to such exercise and (ii) a place and date not
     earlier than three business days nor later than 30 business days from the
     Notice Date for the closing of such purchase (the "Closing Date"); provided
     that, if the closing of the purchase and sale pursuant to the Option (the
     "Closing") cannot be consummated by reason of any applicable judgment,
     decree, order, law or regulation, the period of time that otherwise would
     run pursuant to this sentence shall run instead from the date on which such
     restriction or consummation has expired or been terminated; and provided
     further, without limiting the foregoing, that if prior notification to or
     approval of the Federal Reserve Board or any other regulatory authority is
     required in connection with such purchase, the Company shall promptly file
     the required notice or application for approval and shall expeditiously
     process the same (and Seller shall fully cooperate with the Company in the
     filing of any such notice or application and the
 
                                       B-2
<PAGE>   134
 
     obtaining of any such approval), and the period of time that otherwise
     would run pursuant to this sentence shall run instead from the date on
     which, as the case may be, (i) any required notification period has expired
     or been terminated or (ii) such approval has been obtained, and in either
     event, any requisite waiting period has passed.
 
          (f) Notwithstanding Section 2(e), in no event shall any Closing Date
     be more than 18 months after the related Notice Date, and if the Closing
     Date shall not have occurred within 18 months after the related Notice Date
     due to the failure to obtain any such required approval, the exercise of
     the Option effected on the Notice Date shall be deemed to have expired. In
     the event (i) the Company receives official notice that an approval of the
     Federal Reserve Board or any other regulatory authority required for the
     purchase of Option Shares would not be issued or granted or (ii) a Closing
     Date shall not have occurred within 18 months after the related Notice Date
     due to the failure to obtain any such required approval, the Company shall
     be entitled to exercise its rights as set forth in Section 7 or to exercise
     the Option in connection with the resale of Seller Common Stock or other
     securities pursuant to a registration statement as provided in Section 8.
 
     3. PAYMENT AND DELIVERY OF CERTIFICATES. (a) On each Closing Date, the
Company shall pay to Seller in immediately available funds by wire transfer to a
bank account designated by Seller an amount equal to the Purchase Price
multiplied by the number of Option Shares to be purchased on such Closing Date.
 
          (b) At each Closing, simultaneously with the delivery of immediately
     available funds as provided in Section 3(a), Seller shall deliver to the
     Company a certificate or certificates representing the Option Shares to be
     purchased at such Closing, which Option Shares shall be free and clear of
     all liens, claims, charges and encumbrances of any kind whatsoever, except
     as provided by Section 180.0622(2)(b) of the WBCL, and the Company shall
     deliver to Seller a letter, in customary form, agreeing that the Company
     shall not offer to sell or otherwise dispose of such Option Shares in
     violation of applicable law or the provisions of this Agreement.
 
          (c) Certificates for the Option Shares delivered at each Closing shall
     be endorsed with restrictive legend which shall read substantially as
     follows:
 
        THE TRANSFER OF THE STOCK REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO
        RESTRICTIONS ARISING UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND
        PURSUANT TO THE TERMS OF A STOCK OPTION AGREEMENT DATED AS OF SEPTEMBER
        19, 1993. A COPY OF SUCH AGREEMENT WILL BE PROVIDED TO THE HOLDER HEREOF
        WITHOUT CHARGE UPON RECEIPT BY SELLER OF A WRITTEN REQUEST THEREFOR.
 
It is understood and agreed that the above legend shall be removed by delivery
of substitute certificate(s) without such legend if the Company shall have
delivered to Seller a copy of a letter from the staff of the SEC, or an opinion
of counsel in form and substance reasonably satisfactory to Seller and its
counsel, to the effect that such legend is not required for purposes of the
Securities Act.
 
     4. REPRESENTATIONS AND WARRANTIES OF SELLER. Seller hereby represents and
warrants to the Company as follows:
 
          (a) Due Authorization. Seller has all requisite corporate power and
     authority to enter into this Agreement and, subject to any regulatory
     approvals referred to herein and (with respect to Section 7 only) to the
     provisions of Section 180.0640 of the WBCL, if applicable, to consummate
     the transactions contemplated hereby. The execution and delivery of this
     Agreement and the consummation of the transactions contemplated hereby have
     been duly authorized by all necessary corporate action on the part of
     Seller. This Agreement has been duly executed and delivered by Seller and
     constitutes a valid and binding obligation of Seller, enforceable in
     accordance with its terms.
 
          (b) Authorized Stock. Seller has taken all necessary corporate and
     other action to authorize and reserve and, subject to obtaining the
     governmental and other approvals and consents referred to herein, to permit
     it to issue, and, at all times from the date hereof until the obligation to
     deliver Seller Common
 
                                       B-3
<PAGE>   135
 
     Stock upon the exercise of the Option terminates, will have reserved for
     issuance, upon exercise of the Option, shares of Seller Common Stock
     necessary for the Company to exercise the Option, and Seller will take all
     necessary corporate action to authorize and reserve for issuance all
     additional shares of Seller Common Stock or other securities which may be
     issued pursuant to Section 6 upon exercise of the Option. The shares of
     Seller Common Stock to be issued upon due exercise of the Option, including
     all additional shares of Seller Common Stock or other securities which may
     be issuable pursuant to Section 6, upon issuance pursuant hereto, shall be
     duly and validly issued, fully paid and nonassessable (except as provided
     by Section 180.0622(2)(b) of the WBCL), and shall be delivered free and
     clear of all liens, claims, charges and encumbrances of any kind or nature
     whatsoever, including any preemptive rights of any shareholder of Seller.
 
          (c) No Conflicts. Except as disclosed pursuant to the Merger
     Agreement, the execution and delivery of this Agreement does not, and the
     consummation of the transactions contemplated hereby will not, conflict
     with, or result in any violation of the Seller Articles or Seller By-Laws
     or the Articles of Incorporation or By-Laws of any subsidiary of Seller or,
     subject to obtaining any regulatory approvals or consents contemplated
     hereby, result in any violation of any loan or credit agreement, note,
     mortgage, indenture, lease, Plan or other agreement, obligation,
     instrument, permit, concession, franchise, license, judgment, order,
     decree, statute, law, ordinance, rule or regulation applicable to Seller or
     any Seller Subsidiary or their respective properties or assets which
     violation would have a Material Adverse Effect on Seller or in any manner
     impair the Company's ability to exercise its rights under this Agreement.
 
          (d) Board Action. The Board of Directors of Seller has taken all
     actions necessary under the WBCL and otherwise, including approving the
     transactions contemplated in the Merger Agreement and this Agreement, to
     ensure that (i) none of the restrictions set forth in Sections 180.1140-44
     and 180.1150 of the WBCL do or will apply to the transactions contemplated
     in this Agreement and (ii) no Seller Right is or will become, as a result
     of this Agreement or the transactions contemplated herein, exercisable.
 
     5. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company hereby
represents and warrants to Seller that:
 
          (a) Due Authorization. The Company has all requisite corporate power
     and authority to enter into this Agreement and, subject to any regulatory
     approvals or consents referred to herein, to consummate the transactions
     contemplated hereby. The execution and delivery of this Agreement and the
     consummation of the transactions contemplated hereby have been duly
     authorized by all necessary corporate action on the part of the Company.
     This Agreement has been duly executed and delivered by the Company and
     constitutes a valid and binding obligation of the Company, enforceable in
     accordance with its terms.
 
          (b) No Conflicts. The execution and delivery of this Agreement does
     not, and the consummation of the transactions contemplated hereby will not,
     result in any violation of the Company Articles or Company By-Laws or the
     Articles of Incorporation or By-Laws of any Company Subsidiary or, subject
     to obtaining any regulatory approvals or consents contemplated hereby,
     result in any violation of any loan or credit agreement, note, mortgage,
     indenture, lease, Plan or other agreement, obligation, instrument, permit,
     concession, franchise, license, judgment, order, decree, statute, law,
     ordinance, rule or regulation applicable to the Company or any Company
     Subsidiary or their respective properties or assets which violation would
     have a Material Adverse Effect on the Company.
 
          (c) Purchase Not for Distribution. The Option is not being taken, and
     any Option Shares or other securities acquired by the Company upon exercise
     of the Option will not be taken, with a view to the public distribution
     thereof and will not be transferred or otherwise disposed of except in a
     transaction registered or exempt from registration under the Securities
     Act.
 
     6. ADJUSTMENT UPON SHARE ISSUANCES, CHANGES IN CAPITALIZATION, ETC. (a) In
the event of any change in Seller Common Stock by reason of, without limitation,
a stock dividend, split-up, recapitalization, combination, exchange of shares or
similar transaction, the type and number of shares or securities subject to the
Option, and the Purchase Price therefor, shall be adjusted appropriately, and
proper provision shall be
 
                                       B-4
<PAGE>   136
 
made in the agreements governing such transaction, so that the Company shall
receive upon exercise of the Option the number and class of shares or other
securities or property that the Company would have received in respect of Seller
Common Stock if the Option had been exercised immediately prior to such event,
or the record date therefor, as applicable. If any additional shares of Seller
Common Stock are issued after the date of this Agreement pursuant to, without
limitation, the exercise of employee stock options, a 401(k) plan or other
employee benefit plan, or a dividend reinvestment plan, or otherwise (other than
pursuant to an event described in the first sentence of this Section 6(a)), the
number of shares of seller Common Stock subject to the Option shall be adjusted
so that, after such issuance, the Option equals 19.9% of the number of shares of
Seller Common Stock then issued and outstanding (without giving effect to any
shares subject to or issued pursuant to the Option).
 
          (b) The provisions of this Agreement shall apply with appropriate
     adjustments to any securities for which the Option becomes exercisable
     pursuant to this Section 6.
 
     7. TERMINATION ELECTION BY THE COMPANY. (a) At the request of the Company
at any time (i) commencing upon the first occurrence of an Exercise Event and
ending upon the occurrence of an Exercise Termination Event or (ii) prior to or
on the thirtieth (30th) business day following the occurrence of either of the
events set forth in clauses (i) and (ii) of Section 2(f), the right to exercise
the Option pursuant to Section 2 hereof, to the extent not exercised, shall
terminate and Seller (or any successor entity thereof) shall pay to the Company
the Termination Fee. The Termination Fee (the "Termination Fee") shall be equal
to the excess, if any, of (x) the Applicable Price (as defined below) for each
share of Seller Common Stock over (y) the Purchase Price (subject to adjustment
pursuant to Section 6), multiplied by the number of Option Shares with respect
to which the Option has not been exercised and, where the Option has been
exercised, in whole or in part, but the Closing Date has not occurred, the
number of Option Shares which would have been distributed at the Closing Date.
 
          (b) If the Company exercises its rights under this Section 7, Seller
     shall, within 20 business days after such Election Date, pay the
     Termination Fee to the Company in immediately available funds, and, as of
     the date of and upon such payment, the right to exercise the Option
     pursuant to Section 2 hereof shall terminate. Notwithstanding the
     foregoing, to the extent that prior notification to or approval of the
     Federal Reserve Board or other regulator, authority is required in
     connection with the payment of all or any portion of the Termination Fee,
     Seller shall deliver from time to time that portion of the Termination Fee
     that it is not then so prohibited from paying and shall promptly file the
     required notice or application for approval and shall expeditiously process
     the same (and the Company shall cooperate with Seller in the filing of any
     such notice or application and the obtaining of any such approval), and the
     period of time that otherwise would run pursuant to the preceding sentence
     for the payment of the portion of the Termination Fee requiring such
     notification or approval shall run instead from the date on which, as the
     case may be, (i) any required notification period has expired or been
     terminated or (ii) such approval has been obtained and, in either event,
     any requisite waiting period shall have passed. If the Federal Reserve
     Board or any other regulatory authority prohibits payment of any part of
     the Termination Fee, Seller shall promptly give notice of such fact to the
     Company and the Company shall thereafter have the right to exercise the
     Option as to the number of Option Shares for which the Option was
     exercisable at such Election Date less the number of shares as to which a
     Termination Fee has been delivered pursuant to Section 7(a); provided that,
     if the Option shall have expired pursuant to Section 2 hereof prior to the
     date of such notice or shall be scheduled to expire at any time before the
     expiration of a period ending on the thirtieth (30th) business day after
     such date, the Company shall nonetheless have the right so to exercise the
     Option pursuant to Section 2 hereof until the expiration of such period of
     30 business days.
 
          (c) For purposes of this Agreement, the "Applicable Price" means the
     highest of (i) the highest price per share at which a tender or exchange
     offer has been made for shares of Seller Common Stock after the date of
     this Agreement and on or prior to such Election Date, (ii) the price per
     share to be paid by any third party for shares of Seller Common Stock or
     the consideration per share to be received by holders of Seller Common
     Stock, in each case pursuant to an agreement for a merger or other business
     combination transaction with Seller entered into on or prior to such
     Election Date or (iii) the highest bid price per share as quoted on the
     NASDAQ/NMS (or, if the shares of Seller Common Stock are no
 
                                       B-5
<PAGE>   137
 
     longer quoted thereon, on the principal trading market on which such shares
     are traded as reported by a recognized source) during the 30 business days
     preceding such Election Date. If the consideration to be offered, paid or
     received pursuant to either of the foregoing clauses (i) or (ii) shall be
     other than in cash, the value of such consideration shall be determined in
     good faith by an independent investment banking firm selected by the
     Company and reasonably acceptable to Seller, which determination shall be
     conclusive for all purposes of this Agreement.
 
     8. REGISTRATION RIGHTS. Seller shall, if requested by the Company at any
time and from time to time (a) within three years of the first exercise of the
Option or (b) for 30 business days following the occurrence of either of the
events set forth in clauses (i) and (ii) of Section 2(f) or receipt by the
Company of official notice that an approval of the Federal Reserve Board or any
other regulatory authority required to complete the transactions contemplated by
Section 7 hereof would not be issued or granted, as expeditiously as possible
prepare and file up to two registration statements under the Securities Act if
such registration is necessary in order to permit the sale or other disposition
of any or all shares of Seller Common Stock or other securities that have been
acquired by or are issuable to the Company upon exercise of the Option in
accordance with the intended method of sale or other disposition stated by the
Company, including a "shelf" registration statement under Rule 415 under the
Securities Act or any successor provision, and Seller shall use its best efforts
to qualify such shares or other securities under any applicable state securities
laws. The Company agrees to use all reasonable efforts to cause, and to cause
any underwriters of any sale or other disposition to cause, any sale or other
disposition pursuant to such registration statement to be effected on a widely
distributed basis so that upon consummation thereof no purchaser or transferee
shall own beneficially 2% or more of the then outstanding voting power of
Seller. Seller shall use all reasonable efforts to cause each such registration
statement to become effective, to obtain all consents or waivers of other
parties which are required therefor and to keep such registration statement
effective for such period not in excess of 120 days from the day such
registration statement first becomes effective as may be reasonably necessary to
effect such sale or other disposition. In the event that the Company requests
Seller to file a registration statement following the failure to obtain a
required approval for an exercise of the Option as described in Section 2(f),
the closing of the sale or other disposition of Seller Common Stock or other
securities pursuant to such registration statement shall occur substantially
simultaneously with the exercise of the Option. The obligations of Seller
hereunder to file a registration statement and to maintain its effectiveness may
be suspended for one or more periods of time not exceeding 90 days in the
aggregate if the Board of Directors of Seller shall have determined that the
filing of such registration statement or the maintenance of its effectiveness
would require disclosure of nonpublic information that would materially and
adversely affect Seller, provided that the option/exercise period shall be
extended during any such period. Any registration statement prepared and filed
under this Section 8, and any sale covered thereby, shall be at Seller's expense
except for underwriting discounts or commissions, brokers' fees and the fees and
disbursements of the Company's counsel related thereto. The Company shall
provide all information reasonably requested by Seller for inclusion in any
registration statement to be filed hereunder. If, during the time periods
referred to in the first sentence of this Section 8, Seller effects a
registration under the Securities Act of Seller Common Stock for its own account
or for any other shareholders of Seller (other than on Form S-4 or Form S-8, or
any successor form), it shall allow the Company the right to participate in such
registration, and such participation shall not affect the obligation of Seller
to effect two registration statements for the Company under this Section 8;
provided that, if the managing underwriters of such offering advise Seller in
writing that in their opinion the number of shares of Seller Common Stock
requested to be included in such registration exceeds the number which can be
sold in such offering, Seller shall include the shares requested to be included
therein by the Company only to the extent permitted by the managing underwriters
consistent with the financing requirements of the Seller. In connection with any
registration pursuant to this Section 8, Seller and the Company shall provide
each other and any underwriter of the offering with customary representations,
warranties, covenants, indemnification and contribution in connection with such
registration.
 
     9. FIRST REFUSAL. At any time after the first occurrence of an Exercise
Event and prior to the latter of (a) the expiration of 24 months immediately
following the first purchase of shares of Seller Common Stock pursuant to the
Option and (b) the expiration of the Option pursuant to Section 2(a), if the
Company shall desire to sell, assign, transfer or otherwise dispose of all or
any of the shares of Seller Common Stock or other
 
                                       B-6
<PAGE>   138
 
securities acquired by it pursuant to the Option to a third party offeror
pursuant to a bona fide offer, it shall give Seller written notice of the
proposed transaction (an "Offeror's Notice"), identifying the proposed
transferee, accompanied by a copy of any written offer from, or purchase
agreement with, such transferee and setting forth the terms of the proposed
transaction. An Offeror's Notice shall be deemed an offer by the Company to
Seller, which may be accepted within 15 business days of the receipt of such
Offeror's Notice, on the same terms and conditions and at the same price at
which the Company is proposing to transfer such shares or other securities to
such transferee. The purchase of any such shares or other securities by Seller
shall be settled within 20 business days of the date of the acceptance of the
offer and the purchase price shall be paid to the Company in immediately
available funds against delivery of the certificates representing such shares or
other securities in proper form for transfer, provided that, if prior
notification to or approval of the Federal Reserve Board or any other regulatory
authority is required in connection with such purchase, Seller shall promptly
file the required notice or application for approval and shall expeditiously
process the same (and the Company shall cooperate with Seller in the filing of
any such notice or application and the obtaining of any such approval) and the
period of time that otherwise would run pursuant to this sentence shall run
instead from the date on which, as the case may be, (a) any required
notification period has expired or been terminated or (b) such approval has been
obtained and, in either event, any requisite waiting period shall have passed.
In the event of the failure or refusal of Seller to purchase all the shares of
other securities covered by an Offeror's Notice or if the Federal Reserve Board
or any other regulatory authority disapproves Seller's proposed purchase of such
shares or other securities, the Company may, within 60 days from the date of the
Offeror's Notice (subject to any necessary extension for regulatory
notification, approval or waiting periods), sell all, but not less than all, of
such shares or other securities to the third party offeror at no less than the
price specified and on terms no more favorable than those set forth in the
Offeror's Notice. The requirements of this Section 9 shall not apply to (v) any
disposition as a result of which the third party offeror would own beneficially
less than 2% of the outstanding voting power of Seller, (w) any disposition of
Seller Common Stock or other securities by a person to whom the Company has
assigned its rights under the Option with the consent of Seller; (x) any sale by
means of a public offering registered under the Securities Act in which steps
are taken to reasonably assure that no purchaser will acquire securities
representing 2% or more of the outstanding voting power of Seller, (y) any
transfer to any wholly owned direct or indirect subsidiary of the Company which
agrees in writing to be bound by the terms hereof or (z) any sale or transfer to
any party engaging in a Competing Transaction which has been approved by the
Board of Directors of Seller.
 
     10. LISTING. If Seller Common Stock or any other securities to be acquired
upon exercise of the Option are then listed on the NASDAQ/NMS or a national
securities exchange, Seller, upon the request of the Company, will promptly file
an application to list the shares of Seller Common Stock or other securities to
be acquired upon exercise of the Option on the NASDAQ/NMS or a national
securities exchange, as the case may be, and will use its best efforts to obtain
approval of such listing as soon as practicable.
 
     11. DIVISION OF OPTION. This Agreement (and the Option granted hereby) are
exchangeable, without expense, at the option of the Company, upon presentation
and surrender of this Agreement at the principal office of Seller for other
Agreements providing for Options of different denominations entitling the holder
thereof to purchase in the aggregate the same number of shares of Seller Common
Stock purchasable hereunder. The terms "Agreement" and "Option" as used herein
include any other Agreements and related Options for which this Agreement (and
the Option granted hereby) may be exchanged. Upon receipt by Seller of evidence
reasonably satisfactory to it of the loss, theft, destruction or mutilation of
this Agreement, and (in the case of loss, theft or destruction) of reasonably
satisfactory indemnification, and upon surrender and cancellation of this
Agreement, if mutilated, Seller will execute and deliver a new Agreement of like
tenor and date.
 
     12. MISCELLANEOUS. (a) Expenses. Except as otherwise provided in Section 8,
or in the Merger Agreement, each of the parties hereto shall bear and pay all
costs and expenses incurred by it or on its behalf in connection with the
transactions contemplated hereunder, including fees and expenses of its own
financial consultants, investment bankers, accountants and counsel.
 
          (b) Waiver and Amendment. Any provision of this Agreement may be
     waived at any time by the party that is entitled to the benefits of such
     provision. This Agreement may not be modified, amended,
 
                                       B-7
<PAGE>   139
 
     altered or supplemented except upon the execution and delivery of a written
     agreement executed by the parties hereto.
 
          (c) Entire Agreement; No Third-Party Beneficiary; Severability. Except
     as otherwise set forth in the Merger Agreement, this Agreement (including
     the Merger Agreement and the other documents and instruments referred to
     herein or therein) (i) constitutes the entire agreement and supersedes all
     prior agreements and understandings, both written and oral, between the
     parties with respect to the subject matter hereof and (ii) is not intended
     to confer upon any person other than the parties hereto any rights or
     remedies hereunder. If any term, provision, covenant or restriction of this
     Agreement is held by a court of competent jurisdiction or a federal or
     state regulatory agency to be invalid, void or unenforceable, the remainder
     of the terms, provisions, covenants and restrictions of this Agreement
     shall remain in full force and effect and shall in no way be affected,
     impaired or invalidated. If for any reason such court or regulatory agency
     determines that the Option does not permit the Company to acquire, or does
     not require Seller to comply with Section 7 hereof with respect to the full
     number of shares of Seller Common Stock as provided in Sections 2 and 7 (as
     adjusted pursuant to Section 6), it is the express intention of Seller to
     allow the Company to acquire or to require Seller to comply with Section 7
     hereof with respect to such lesser number of shares as may be permissible
     without any amendment or modification hereof.
 
          (d) Governing Law. This Agreement shall be governed and construed in
     accordance with the laws of the State of Wisconsin without regard to any
     applicable conflicts of law rules.
 
          (e) Descriptive Headings. The descriptive headings contained herein
     are for convenience of reference only and shall not affect in any way the
     meaning or interpretation of this Agreement.
 
          (f) Notices. All notices and other communications hereunder shall be
     in writing and shall be deemed given if delivered personally, telecopied
     (with confirmation) or mailed by registered or certified mail (return
     receipt requested) to the parties at the following addresses (or at such
     other address for a party as shall be specified by like notice):
 
       If to Seller to:

       Valley Bancorporation
       100 West Lawrence Street
       P.O. Box 1061
       Appleton, WI 54912-1061
       Telecopier: (414) 738-5120
       Attention: Peter M. Platten III

       with a copy to:

       Quarles & Brady
       411 East Wisconsin Avenue
       Milwaukee, WI 53202
       Telecopier: (414) 271-3552
       Attention: Bruce C. Davidson
 
                                       B-8
<PAGE>   140
 
       If to the Company to:

       Marshall & Ilsley Corporation
       770 North Water Street
       Milwaukee, WI 53202
       Telecopier: (414) 764-7788
       Attention: Gordon H. Gunnlaugsson

       with a copy to:

       Godfrey & Kahn, S.C.
       780 North Water Street
       Milwaukee, WI 53202
       Telecopier: (414) 273-5198
       Attention: Kenneth C. Hunt
 
          (g) Counterparts. This Agreement and any amendments hereto may be
     executed in two counterparts, each of which shall be considered one and the
     same agreement and shall become effective when both counterparts have been
     signed by each of the parties and delivered to the other party, it being
     understood that both parties need not sign the same counterpart.
 
          (h) Assignment. Neither this Agreement nor any of the rights,
     interests or obligations hereunder or under the Option shall be assigned by
     any of the parties hereto (whether by operation of law or otherwise)
     without the prior written consent of the other party, except that the
     Company may assign this Agreement to any wholly owned direct or indirect
     subsidiary of the Company. Subject to the preceding sentence, this
     Agreement shall be binding upon, inure solely to the benefit of and be
     enforceable solely by the parties and their respective successors and
     assigns.
 
          (i) Further Assurances. In the event of any exercise of the Option by
     the Company, Seller and the Company shall execute and deliver all other
     documents and instruments and take all other action that may be reasonably
     necessary in order to consummate the transactions provided for by such
     exercise.
 
          (j) Specific Performance. The parties hereto agree that this Agreement
     may be enforced by either party through specific performance, injunctive
     relief and other equitable relief. Both parties further agree to waive any
     requirement for the securing or posting of any bond in connection with the
     obtaining of any such equitable relief and that this provision is without
     prejudice to any other rights that the parties hereto may have for any
     failure to perform this Agreement.
 
     IN WITNESS WHEREOF, Seller and the Company have caused this Stock Option
Agreement to be signed by their respective officers thereunto duly authorized,
as of the day and year first written above.
 
                              VALLEY BANCORPORATION
                   
                              By:         /S/ PETER M. PLATTEN, III
                                 Name:    Peter M. Platten, III
                                 Title:   President and Chief Executive Officer
                   
                                  MARSHALL & ILSLEY CORPORATION
                   
                              By:         /S/ J. B. WIGDALE
                                 Name:    J. B. Wigdale
                                 Title:   Chairman of the Board and Chief 
                                          Executive Officer
                   
                                       B-9
<PAGE>   141
 
                                                                      APPENDIX C
 
              PROPOSED AMENDMENT TO MARSHALL & ILSLEY CORPORATION
                       RESTATED ARTICLES OF INCORPORATION
 
     1. Article III shall be amended by changing the number of authorized shares
listed opposite Common Stock to read as follows:
 
<TABLE>
<CAPTION>
        DESIGNATION                          PAR VALUE    AUTHORIZED
        OF CLASS                             PER SHARE      SHARES
        ----------------------------------  -----------   -----------
        <S>                                 <C>          <C>
        Common Stock......................  $1.00        160,000,000
</TABLE>
 
Except as set forth above, Article III shall remain in full force and effect
without further amendment or modification.
 
     2. Article VI shall be amended as follows:
 
          (i) by deleting the second sentence of the first paragraph thereof in
     its entirety, which sentence states:
 
             "The number of directors (exclusive of directors, if any, elected
        by the holders of one or more series of Preferred Stock, voting
        separately as a series pursuant to the provisions of these Amended and
        Restated Articles of Incorporation applicable thereto) shall be not less
        than 8 nor more than 15 directors, the exact number of directors to be
        determined from time to time by resolution adopted by affirmative vote
        of a majority of the entire Board of Directors then in office."
 
     and replacing said second sentence with the following:
 
             "The number of directors (exclusive of directors, if any, elected
        by the holders of one or more series of Preferred Stock, voting
        separately as a series pursuant to the provisions of these Amended and
        Restated Articles of Incorporation applicable thereto) shall be not less
        than 3 directors, the exact number of directors to be determined from
        time to time by resolution adopted by affirmative vote of a majority of
        the entire Board of Directors then in office."
 
          (ii) by deleting the second sentence of the second paragraph thereof
     in its entirety, which sentence states:
 
             "Any newly created directorship resulting from an increase in the
        number of directors and any other vacancy on the Board of Directors,
        however caused, shall be filled by the vote of a majority of the
        directors then in office, although less than a quorum, or by a sole
        remaining director; provided, however, that if the number of directors
        is increased, not more than two such newly created directorships may be
        filled by the directors in any period between annual meetings of
        shareholders."
 
     and replacing said second paragraph with the following:
 
             "Any newly created directorship resulting from an increase in the
        number of directors and any other vacancy on the Board of Directors,
        however caused, shall be filled by the vote of a majority of the
        directors then in office, although less than a quorum, or by a sole
        remaining director."
 
Except as set forth above, Article VI shall remain in full force and effect
without further amendments or modification.
 
                                       C-1
<PAGE>   142
 
                                                                      APPENDIX D
 
                         [SALOMON BROTHERS LETTERHEAD]
 
                                          December 29, 1993
 
The Board of Directors
Marshall & Ilsley Corporation
770 North Water Street
Milwaukee, WI 53202
 
Members of the Board:
 
You have requested our opinion as investment bankers as to the fairness, from a
financial point of view, to the shareholders of Marshall & Ilsley Corporation
(the "Company") of the exchange ratio in the proposed merger (the "Merger") of
Valley Bancorporation ("Valley"), with and into the Company, pursuant to the
Agreement and Plan of Merger dated as of September 19, 1993 among the Company
and Valley (the "Merger Agreement"). Under the terms of the Merger Agreement,
each outstanding share of common stock, par value $0.50 per share, of Valley
will be converted into 1.72 shares of common stock, par value $1.00 per share,
of the Company (giving effect to Valley's 3-for-2 stock split effective August
27, 1993 payable to shareholders of record on August 6, 1993). You have informed
us and we have assumed that the Merger will be accounted for as a
pooling-of-interests and will constitute a tax-free transaction under the
Internal Revenue Code.
 
As you are aware, Salomon Brothers Inc from time to time has provided investment
banking and financial advisory services to the Company for which we have
received customary compensation. Such services have included acting as agent for
the Company's Medium Term Note Program and as a managing underwriter of an
offering of subordinated debentures of the Company in 1993 for which we have
received customary compensation. In addition, in the ordinary course of our
business, we actively trade the debt and equity securities of the Company and
Valley for our own account and for the accounts of our customers and,
accordingly, at any time may hold a long or short position in such securities.
We may also assist the Company in the divestiture of certain assets necessary
 
                                       D-1
<PAGE>   143
 
Marshall & Ilsley Corporation
December 29, 1993
Page 2
 
to obtain regulatory approval of the Merger, and it is expected that we would
receive customary compensation for such services.
 
In arriving at our opinion, we have reviewed, among other things, the following:
(i) the Merger Agreement; (ii) the Joint Proxy Statement -- Prospectus in
substantially the form to be sent to the Company's shareholders; (iii) the
Annual Reports on Form 10-K of the Company and of Valley for each year in the
three-year period ended December 31, 1992; (iv) the Quarterly Reports on Form
10-Q of the Company and of Valley for the three-month periods ended March 31,
1993, June 30, 1993 and September 30, 1993; (v) Reports on Form 8-K of the
Company dated September 19, 1993, as amended, and of Valley dated September 19,
1993; (vi) certain other publicly available financial and other information
concerning the Company and Valley, and the trading markets for the publicly
traded securities of the Company and Valley; (vii) certain other internal
information, including projections, relating to the Company and Valley, prepared
by the managements of the Company and Valley and furnished to us for purposes of
our analysis; and (viii) publicly available information concerning certain other
banks and bank holding companies, the trading markets for their securities and
the nature and terms of certain other merger and acquisition transactions we
believe relevant to our inquiry. We have also met with certain officers and
representatives of the Company and Valley to discuss the foregoing, as well as
other matters we believe relevant to our inquiry.
 
In conducting our review and in arriving at our opinion, we have relied upon and
assumed the accuracy and completeness of the financial and other information
provided to us or publicly available and have not attempted independently to
verify the same. We have relied upon the managements of the Company and Valley
as to the reasonableness and achievability of the projections (and the
assumptions and bases therefor) provided to us, and we have assumed that such
projections reflect the best currently available estimates and judgments of such
managements and that such projections will be realized in the amounts and in the
time periods currently estimated by such managements. We have also assumed,
without independent verification, that the aggregate allowances for loan losses
for the Company and Valley are adequate to cover such losses. We have not made
or obtained any evaluations or appraisals of the property of the Company or
Valley, nor have we examined any individual loan credit files. It is understood
that we were retained by the Board of Directors of the Company, and that our
opinion as expressed herein is limited to the fairness, from a financial point
of view, to the shareholders of the Company of the
                                       D-2
<PAGE>   144
 
Marshall & Ilsley Corporation
December 29, 1993
Page 3
 
exchange ratio in the Merger and does not address the Company's underlying
business decision to proceed with the Merger.
 
We have considered such financial and other factors as we have deemed
appropriate under the circumstances, including among others the following: (i)
the historical and current financial position and results of operations of the
Company and Valley, including interest income, interest expense, net interest
income, net interest margin, non-interest income, non-interest expense,
earnings, dividends, internal capital generation, book value, intangible assets,
return on assets, return on shareholders' equity, capitalization, the amount and
type of non-performing assets, loan losses and the reserve for loan losses, all
as set forth in the financial statements for the Company and Valley; (ii) the
assets and liabilities of the Company and Valley, including the loan and
investment portfolios, deposits, other liabilities, historical and current
liability sources and costs and liquidity; and (iii) the nature and terms of
certain other merger and acquisition transactions involving banks and bank
holding companies. We have also taken into account our assessment of general
economic, market and financial conditions and our experience in other
transactions, as well as our experience in securities valuation and our
knowledge of the banking industry generally. Our opinion is necessarily based
upon conditions as they exist and can be evaluated on the date hereof and the
information made available to us through the date hereof. This letter does not
constitute a recommendation to the Board of Directors or to any shareholder of
the Company with respect to any approval of the Merger.
 
Based upon and subject to the foregoing, we are of the opinion as investment
bankers that, as of the date hereof, the exchange ratio in the Merger is fair,
from a financial point of view, to the shareholders of the Company.
 
                                          Very truly yours,
 
                                          /s/ SALOMON BROTHERS INC
 
                                       D-3
<PAGE>   145
 
                                                                      APPENDIX E
 
                   [OPINION OF KEEFE, BRUYETTE & WOODS, INC.]
 
                                          December 30, 1993
 
The Board of Directors
Valley Bancorporation
100 West Lawrence Street
Appleton, Wisconsin 54912
 
Members of the Board:
 
     You have requested our opinion as investment bankers as to the fairness,
from a financial point of view, to the shareholders of Valley Bancorporation
("Valley") of the exchange ratio in the proposed merger (the "Merger") of Valley
with and into Marshall & Ilsley Corporation ("M&I"), pursuant to the Agreement
and Plan of Merger dated as of September 19, 1993 between M&I and Valley (the
"Agreement"). Under the terms of the Agreement, each outstanding share of common
stock, $.50 par value, of Valley (the "Common Shares") will be converted into
1.72 shares of common stock, $1.00 par value, of M&I (the "Exchange Ratio").
 
     Keefe, Bruyette & Woods, Inc., as part of its investment banking business,
is continually engaged in the valuation of bank and bank holding company
securities in connection with acquisitions, negotiated underwritings, secondary
distributions of listed and unlisted securities, private placements and
valuations for various other purposes. As specialists in the securities of
banking companies, we have experience in, and knowledge of, the valuation of
banking enterprises. In the ordinary course of our business as a broker-dealer,
we may, from time to time, purchase securities from, and sell securities to,
Valley and M&I and as a market maker in securities we may from time to time have
a long or short position in, and buy or sell, debt or equity securities of
Valley and M&I for our own account and for the accounts of our customers. To the
extent we have any such position as of the date of this opinion it has been
disclosed to Valley. We have acted exclusively for the Board of Directors of
Valley in rendering this fairness opinion and will receive a fee from Valley for
our services.
 
     In arriving at our opinion, we have reviewed, analyzed and relied upon
material bearing upon the financial and operating condition of Valley and M&I,
including, among other things, the following: (i) the Agreement; (ii) the
Registration Statement on Form S-4 filed by M&I to register the shares of its
common stock to be issued in the Merger; (iii) Annual Reports to Shareholders
and Annual Reports on Form 10-K for the three years ended December 31, 1992 of
Valley and M&I; (iv) certain interim reports to shareholders of Valley and M&I
and Quarterly Reports on Form 10-Q of Valley and M&I and certain other
communications from Valley and M&I to their respective shareholders; (v) other
financial information concerning the businesses and operations of Valley and M&I
furnished to us by Valley and M&I for purposes of our analysis, including
certain internal financial analyses and forecasts for Valley and M&I prepared by
the senior management of Valley and M&I; (vi) plans for the combined company and
the strategic objectives of the Merger with the senior executives of M&I and
Valley; (vii) certain publicly available information concerning trading of, and
the trading market for, the common stock of Valley and M&I; and (viii) certain
publicly available information with respect to banking companies and the nature
and terms of certain other transactions that we consider relevant to our
inquiry.
 
                                       E-1
<PAGE>   146
 
Board of Directors
Valley Bancorporation
December 30, 1993
 
     In conducting our review and arriving at our opinion, we have relied upon
and assumed the accuracy and completeness of all of the financial and other
information provided to us or publicly available and we have not attempted
independently to verify such information. We have relied upon the management of
Valley and M&I as to the reasonableness and achievability of the financial and
operating forecasts and projections (and the assumptions and bases therefor)
provided to us, and we have assumed that such forecasts and projections reflect
the best currently available estimates and judgments of such managements and
that such forecasts and projections will be realized in the amounts and in the
time periods currently estimated by such managements. We have also assumed,
without independent verification, that the aggregate allowances for loan losses
for Valley and M&I are adequate to cover such losses. We have not made or
obtained any evaluations or appraisals of the property of Valley or M&I, nor
have we examined any individual loan credit files. Finally, you have informed us
and we have assumed that the Merger will be recorded as a pooling of interests
under generally accepted accounting principles.
 
     We have considered such financial and other factors as we have deemed
appropriate under the circumstances, including among others the following: (i)
the historical and current financial position and results of operations of
Valley and M&I, including interest income, interest expense, net interest
income, net interest margin, non-interest income, non-interest expense,
earnings, dividends, internal capital generation, book value, intangible assets,
return on assets, return on shareholders' equity, capitalization, the amount and
type of non-performing assets, loan losses and the reserve for loan losses, all
as set forth in the financial statements for Valley and for M&I; (ii) the assets
and liabilities of Valley and M&I, including the loan, investment and mortgage
portfolios, deposits, other liabilities, historical and current liability
sources and costs and liquidity; and (iii) the nature and terms of certain other
merger transactions involving banks and bank holding companies. We have also
taken into account our assessment of general economic, market and financial
conditions and our experience in other transactions, as well as our experience
in securities valuation and our knowledge of the banking industry generally. Our
opinion is necessarily based upon conditions as they exist and can be evaluated
on the date hereof and the information made available to us through the date
hereof.
 
     Based upon and subject to the foregoing, we are of the opinion that, as of
the date hereof, the Exchange Ratio in the Merger is fair, from a financial
point of view, to the holders of the Common Shares.
 
                                          Very truly yours,
 
                                          [SIGNATURE]
 
                                          Keefe, Bruyette & Woods, Inc.
 
                                       E-2
<PAGE>   147
 
                                                                      APPENDIX F
 
                         MARSHALL & ILSLEY CORPORATION
                        1993 EXECUTIVE STOCK OPTION PLAN
 
1. PURPOSE OF THE PLAN.
 
     The purpose of the Plan is to promote the best interests of Marshall &
Ilsley Corporation and its shareholders by providing key employees of Marshall &
Ilsley Corporation and its Subsidiaries with an opportunity to acquire a
proprietary interest in Marshall & Ilsley Corporation thereby providing a
stronger incentive for them to put forth maximum effort for the continued
success and growth of Marshall & Ilsley Corporation. In addition, the
opportunity to acquire a proprietary interest in Marshall & Ilsley Corporation
will aid in attracting and retaining key personnel.
 
2. DEFINITIONS.
 
     Unless the context otherwise requires, the following terms shall have the
meanings set forth below:
 
     (a) "Cause" shall mean the discharge of an Employee on account of fraud or
embezzlement against the Company or its Subsidiaries or serious and wilful acts
of misconduct detrimental to the business of the Company or its Subsidiaries or
their reputations.
 
     (b) "Code" shall mean the Internal Revenue Code of 1986, as amended.
 
     (c) "Committee" shall mean the Committee of the Board of Directors
constituted as provided in Paragraph 4 of the Plan.
 
     (d) "Company" shall mean Marshall & Ilsley Corporation, a Wisconsin
corporation.
 
     (e) "Employees" shall mean those individuals who are full-time employees of
the Company or its Subsidiaries, from among whom the Committee may select the
holders of Options.
 
     (f) "Holder" shall mean an Employee to whom an Option has been granted.
 
     (g) "Incentive Stock Option" shall mean an option to purchase Shares which
complies with the provisions of Section 422 of the Code.
 
     (h) "Market Price" shall mean the closing sale price of a Share on the
NASDAQ National Market System as reported in the Midwest Edition of the Wall
Street Journal, or such other market price as the Committee may determine in
conformity with pertinent law and regulations of the Treasury Department.
 
     (i) "1934 Act" shall mean the Securities Exchange Act of 1934, as amended.
 
     (j) "Nonstatutory Stock Option" shall mean an option to purchase Shares
which does not comply with the provisions of Section 422 of the Code.
 
     (k) "Option" shall mean an Incentive Stock Option or Nonstatutory Stock
Option granted under the Plan.
 
     (l) "Option Agreement" shall mean the agreement between the Company and an
Employee whereby an Option is granted to such Employee.
 
     (m) "Parent" shall mean a parent corporation of the Company as defined in
Section 424(e) of the Code.
 
     (n) "Plan" shall mean the 1993 Executive Stock Option Plan of the Company.
 
     (o) "Share" or "Shares" shall mean the $1.00 par value Common Stock of the
Company.
 
     (p) "Subsidiary" shall mean a subsidiary corporation of the Company as
defined in Section 424(f) of the Code.
 
                                       F-1
<PAGE>   148
 
     (q) "Triggering Event" shall mean any of the following: (A) the
commencement by any person or group of persons, other than the Company or a
Subsidiary, of a tender or exchange offer for twenty-five percent (25%) or more
of the outstanding shares of the common stock of the Company; (b) the acceptance
by the Board of Directors of the Company of, or the public recommendation by the
Board that the stockholders of the Company accept, an offer from any person or
group of persons, other than the Company or a Subsidiary, to acquire twenty-five
percent (25%) or more of either the outstanding shares of the common stock of
the Company or the consolidated assets of the Company; (c) the acquisition, by
any person or group of persons, of the beneficial ownership or the right to
acquire beneficial ownership of twenty-five percent (25%) or more of the
outstanding shares of the common stock of the Company (the term "group" and
"beneficial ownership" as used in this paragraph having the meanings assigned
thereto in Section 13(d) of the 1934 Act and the regulations promulgated
thereunder); or (d) the Company (or any Subsidiary or Subsidiaries in the
aggregate representing at least 25% of the consolidated assets of the Company),
shall have entered into an agreement with any person, or any person shall have
filed a draft or final application or notice with the Board of Governors of the
Federal Reserve System or the Office of the Comptroller of the Currency or any
other federal or state regulatory agency for approval, to (i) merge or
consolidate with, or enter into any similar transaction with, the Company or
such Subsidiary, in which the Company or Subsidiary is not the survivor (ii)
purchase, lease or otherwise acquire all or substantially all of the assets of
the Company or such Subsidiary or (iii) purchase or otherwise acquire (including
by way of merger, consolidation, share exchange or any similar transaction) or
otherwise hold or own, securities representing twenty-five percent (25%) or more
of the voting power of the Company or such Subsidiary.
 
3. SHARES RESERVED UNDER PLAN.
 
     The aggregate number of Shares which may be issued or sold under the Plan
shall not exceed 3,000,000 Shares, which may be treasury Shares or authorized
but unissued Shares, or a combination of the two, subject to adjustment as
provided in Paragraph 13 hereof. Any Shares subject to an Option which expires
or terminates for any reason (whether by voluntary surrender, lapse of time,
termination of employment or otherwise) and is unexercised as to such Shares may
again be the subject of an Option under the Plan. The Holder of an Option shall
be entitled to the rights and privileges of ownership with respect to the Shares
subject to the Option only after actual purchase and issuance of such Shares
pursuant to exercise of all or part of an Option. No Employee shall be eligible
to receive Options for Shares aggregating more than 600,000 of the Shares
reserved under the Plan during the term of the Plan, subject to adjustment as
provided in Paragraph 13 hereof.
 
4. ADMINISTRATION OF THE PLAN.
 
     (a) The Plan shall be administered by the Committee. The Committee shall
consist of not less than three members of the Board of Directors of the Company
and shall be so constituted as to permit the Plan to comply with Rule 16b-3
under the 1934 Act, as such rule is currently in effect or as hereafter modified
or amended ("Rule 16b-3"), Section 162(m) of the Code, or any successor rule or
other statutory or regulatory requirements. The members of the Committee shall
be appointed from time to time by the Board of Directors.
 
     (b) The Committee shall have sole authority in its discretion, but always
subject to the express provisions of the Plan, to determine the Employees to
whom and the time or times at which Options shall be granted, the number of
Shares to be subject to each Option, and the extent to which Options may be
exercised in installments; to interpret the Plan; to prescribe, amend, and
rescind rules and regulations pertaining to the Plan; to determine the terms and
provisions of the respective Option Agreements; and to make all other
determinations and interpretations deemed necessary or advisable for the
administration of the Plan. The Committee's determination of the foregoing
matters shall be conclusive and binding on the Company, all Employees, all
Holders, and all other persons.
 
5. ELIGIBILITY.
 
     Only Employees shall be eligible to receive Options under the Plan. In
determining the Employees to whom Options shall be granted and the number of
Shares to be covered by each Option, the Committee may
                                       F-2
<PAGE>   149
take into account the nature of the services rendered by the respective
Employees, their present and potential contributions to the success of the
Company, and other such factors as the Committee in its discretion shall deem
relevant. An Employee who has been granted an Option under the Plan may be
granted additional Options under the Plan if the Committee shall so determine.
The Company shall effect the granting of Options under the Plan by execution of
Option Agreements in such form as shall be approved by the Committee. No Option
may be granted under the Plan to any person who is then a member of the
Committee.
 
6. OPTIONS: GENERAL PROVISIONS.
 
     (a) Types of Options. Options to purchase Shares granted pursuant to this
Plan shall be specified to be either an Incentive Stock Option (as described in
Paragraph 7) or a Nonstatutory Stock Option (as described in Paragraph 8). An
Option Agreement executed pursuant to this Plan may include both an Incentive
Stock Option and a Nonstatutory Stock Option. An Option Agreement executed
pursuant to this Plan shall in no event provide for the grant of a tandem
Option, wherein two Options are issued together and the exercise of one affects
the right to exercise the other.
 
     (b) Option Exercise Price. The per share exercise price of the Shares under
each Option granted pursuant to this Plan shall be determined by the Committee
but shall not be less than one hundred percent (100%) of the fair market value
per share on the date of grant of such Option. The fair market value per Share
on the date of grant shall be the Market Price for the business day immediately
preceding the date of grant of such Option.
 
     (c) General Exercise Period. No Option granted under this Plan shall
provide for its exercise earlier than six (6) months from its date of grant. The
Committee may, in its discretion, (i) require that a Holder be employed by the
Company or a Subsidiary for a designated number of years prior to the exercise
by the Holder of any Option or portion of an Option granted under this Plan or
(ii) impose additional restrictions on exercise of any Option. The Committee
may, in its discretion, determine the periods during which Options or portions
of Options may be exercised by a Holder, subject only to the terms of this Plan.
Any of the foregoing requirements or limitations subsequently may be reduced or
waived by the Committee in its discretion, unless such reduction or waiver is
prohibited by the Code or other applicable law.
 
     (d) Vesting. If an Option Agreement provides that a Holder must be employed
by the Company or a Subsidiary for a designated period before an Option becomes
exercisable, such Option will become immediately exercisable upon the occurrence
of a Triggering Event.
 
     (e) Payment of Exercise Price. The exercise price shall be payable in whole
or in part in cash or in Shares held by the Holder for more than six months. If
the Employee elects to pay all or a part of the exercise price in Shares, such
Employee may make such payment by delivering to the Company a number of Shares
already owned by the Employee equal in value to the exercise price. All Shares
so delivered shall be valued at their Market Price on the date delivered.
 
7. INCENTIVE STOCK OPTIONS.
 
     This Paragraph sets forth the special provisions that govern Incentive
Stock Options granted under this Plan.
 
     (a) Maximum Calendar Year Grant to Any Employee. The aggregate fair market
value (determined at the time the Option is granted) of the Shares with respect
to which Incentive Stock Options are exercisable for the first time during any
calendar year under this Plan (and under all other plans of the Company or any
Parent or Subsidiary qualifying under Section 422 of the Code) shall not exceed
$100,000 per Employee, and/or any other limit as may be prescribed by the Code
from time to time.
 
     (b) Grant and Exercise Period. No Incentive Stock Option shall (i) be
granted after ten (10) years from the date this Plan is adopted by the Company's
Board of Directors, or (ii) be exercisable after the expiration of ten (10)
years from its date of grant. Every Incentive Stock Option which has not been
exercised within ten years of its date of grant shall lapse upon the expiration
of said ten-year period unless it shall have lapsed at an earlier date.
 
                                       F-3
<PAGE>   150
 
8. TERMINATION OF EMPLOYMENT.
 
     (a) Any Holder whose employment with the Company or a Subsidiary is
terminated due to retirement on such Holder's normal retirement date (as defined
in the M&I Retirement Growth Plan or any successor thereto) or due to early
retirement with the consent of the Committee shall have one (1) year from the
date of such termination of employment to exercise any Option granted hereunder
as to all or part of the Shares subject to such Option, provided, however, that
no Incentive Stock Option shall be exercisable subsequent to ten (10) years
after its date of grant; and provided, further, that on the date of termination
of employment, the Holder then had a present right to exercise such Option.
 
     (b) Any Holder whose employment with the Company or a Subsidiary is
terminated due to disability (as defined in Section 22(e)(3) of the Code) shall
have one (1) year from the date of termination of employment to exercise any
Option granted hereunder as to all or part of the Shares subject to such Option;
provided, however, that no Incentive Stock Option shall be exercisable
subsequent to ten (10) years after its date of grant; and provided, further,
that on the date of termination of employment, the Holder then had a present
right to exercise such Option.
 
     (c) In the event of the death of a Holder while in the employ of the
Company or a Subsidiary, any Option theretofore granted to such Holder shall be
exercisable:
 
          (1) For one (1) year after the Holder's death, but in no event later
     than ten (10) years from its date of grant in the case of an Incentive
     Stock Option;
 
          (2) Only by the personal representative, administrator or other
     representative of the estate of the deceased Holder or by the person or
     persons to whom the deceased Holder's right under the Option shall pass by
     will or the laws of descent and distribution; and
 
          (3) Only to the extent that the deceased Holder would have been
     entitled to exercise such Option on the date of the Holder's death.
 
     (d) If a Holder's employment is terminated for a reason other than those
specified above, the Holder shall have three (3) months from the date of
termination of employment to exercise any Option granted hereunder as to all or
part of the Shares subject thereto (to the extent otherwise exercisable during
the 3-month period). Notwithstanding the foregoing, (i) if a Holder's employment
is terminated for Cause, to the extent an Option is not effectively exercised
prior to such termination, it shall lapse immediately upon termination and (ii)
if a Holder's employment is terminated in anticipation of, or as a result of, a
Triggering Event which results in a transaction which will be accounted for
using the pooling of interests accounting method, any Holder who is an executive
officer for purposes of Section 16(b) of the 1934 Act shall have the greater of
(a) six (6) months and (1) day or (b) ten (10) business days following the
release of 30 days of combined results of the Company and any acquiring company,
to exercise any Option granted hereunder as to all or part of the Shares subject
thereto.
 
     (e) The Committee may in its sole discretion increase the periods permitted
for exercise of an Option following a termination of employment as provided in
Subparagraphs 8(a), (b), (c), and (d), above if allowable under applicable law;
provided, however, in no event shall an Incentive Stock Option be exercisable
subsequent to ten (10) years after its date of grant.
 
     (f) The Plan shall not confer upon any Holder any right with respect to
continuation of employment by the Company or a Subsidiary, nor shall it
interfere in any way with the right of the Company or such Subsidiary to
terminate any Holder's employment at any time.
 
9. TRANSFERABILITY.
 
     Options granted to a Holder under this Plan shall be not transferable and
during the lifetime of the Holder shall be exercisable only by the Holder. A
Holder shall have the right to transfer the Options granted to such Holder upon
such Holder's death, either by the terms of such Holder's will or under the laws
of descent and distribution, subject to the limitations set forth in Paragraph 8
above, and all such distributees
 
                                       F-4
<PAGE>   151
 
shall be subject to all terms and conditions of this Plan to the same extent as
would the Holder if still alive, except as otherwise expressly provided herein
or as determined by the Committee.
 
10. EXERCISE.
 
     An Option Agreement may provide for exercise of its respective Option in
such amounts and at such times as shall be specified therein; provided, however,
except as provided in Paragraph 8, above, no Option may be exercised unless the
Holder is then in the employ of the Company or a Subsidiary and shall have been
continuously so employed since its date of grant. An Option shall be exercisable
by a Holder's giving written notice of exercise to the Secretary of the Company
accompanied by payment of the required exercise price. The Company shall have
the right to delay the issue or delivery of any Shares under the Plan until (a)
the completion of such registration or qualification of such Shares under any
federal or state law, ruling or regulation as the Company shall determine to be
necessary or advisable, and (b) receipt from the Holder of such documents and
information as the Committee may deem necessary or appropriate in connection
with such registration or qualification.
 
11. SECURITIES LAWS.
 
     Each Option Agreement shall contain such representations, warranties and
other terms and conditions as shall be necessary in the opinion of counsel to
the Company to comply with all applicable federal and state securities laws.
 
12. ADJUSTMENT PROVISIONS.
 
     If the Company shall effect a subdivision or consolidation of Shares or
other capital readjustment, the payment of a stock dividend, or other increase
or reduction in the number of Shares outstanding, or shall effect a spin-off,
split-off, or other distribution of assets to shareholders, without receiving
consideration therefor in money, services or property, the number of Shares then
remaining subject to or available for Options, including Shares as to which
Options have been granted but which remain unexercised and Shares reserved for
Options, shall be appropriately adjusted by the Company's Board of Directors
upon the recommendation of the Committee, subject to the express terms and
conditions of this Plan. The limitation on the number of Options for shares
which may be awarded to any Employee contained in Paragraph 3 hereof shall be
adjusted in the same manner.
 
     Subject to any required action by the Company's shareholders, if the
Company shall be a party to any merger or consolidation in which the Company is
not the surviving corporation or any other transaction or series of transactions
which has a reasonable likelihood or a purpose of causing the Shares to be
neither listed on any national securities exchange nor authorized to be quoted
on an inter-dealer quotation system of any registered national securities
association, or registered under Section 12 of the 1934 Act, each outstanding
Option shall pertain to and apply to the securities which a Holder of the number
of Shares subject to the Option would have been entitled to receive pursuant to
such transaction, with any such adjustment in the exercise price as the
Committee shall deem appropriate. A dissolution of the Company or a sale of all
or substantially all of the assets and property of the Company shall cause each
outstanding Option to terminate forthwith; provided, however, that the Holders
of outstanding Options may exercise such Options to the extent exercisable
immediately prior to such dissolution or sale.
 
13. TIME OF GRANTING.
 
     Nothing contained in the Plan or in any resolution adopted or to be adopted
by the Board of Directors or the shareholders of the Company and no action taken
by the Committee shall constitute the granting of any Option hereunder. The
granting of an Option pursuant to the Plan shall take place only when a written
Option Agreement shall have been duly executed by and on behalf of the Company.
 
                                       F-5
<PAGE>   152
 
14. TAXES.
 
     The Company shall be entitled to pay or withhold the amount of any tax
which it believes is required as a result of the grant or exercise of any Option
under the Plan, and the Company may defer making delivery with respect to Shares
obtained pursuant to exercise of any Option, until arrangements satisfactory to
it have been made with respect to any such withholding obligations. An Employee
exercising a Nonstatutory Stock Option may, at his election, satisfy his
obligation for payment of withholding taxes either by having the Company retain
a number of Shares having an aggregate Market Price on the date the Shares are
withheld equal to the amount of the withholding tax or by delivering to the
Company Shares already owned by the Employee having an aggregate Market Price on
the date the Shares are delivered equal to the amount of the withholding tax.
 
15. EFFECTIVENESS OF THE PLAN.
 
     The Plan shall become effective, upon approval of the Company's
Compensation Committee and the Board of Directors on December 16, 1993, subject
to ratification of the Plan by the vote of the holders of a majority of Shares
present or represented and entitled to vote at an annual or special meeting
thereof duly called and held.
 
16. TERMINATION AND AMENDMENT.
 
     Unless the Plan shall theretofore have been terminated as hereinafter
provided, no Incentive Stock Option hereunder shall be granted after December
15, 2003. The Plan may be terminated, modified or amended by the affirmative
vote of the holders of a majority of the Shares of the Company present, or
represented, and entitled to vote at a meeting of the shareholders of the
Company. The Board of Directors of the Company may also terminate the Plan or
make such modifications or amendments thereof as it shall deem advisable,
including such modifications or amendments as it shall deem advisable in order
to conform to any law or regulation applicable thereto; provided, however, that
the Board of Directors may not, unless otherwise permitted under the federal
securities laws, without further approval of the shareholders of the Company,
adopt any amendment to the Plan which would cause the Plan to no longer comply
with Rule 16b-3, or any successor rule or other regulatory requirements. No
termination, modification or amendment of the Plan may, without the consent of
the Holder, adversely affect the rights of such Holder under an outstanding
Option then held by the Holder.
 
17. RULE 16B-3
 
     (a) It is intended that the Plan and any award made to a person subject to
Section 16 of the 1934 Act, and any transaction or election hereunder by any
such person, meet all of the requirements of Rule 16b-3. If any provision of the
Plan or any award hereunder would disqualify the Plan or such award under, or
would not comply with, Rule 16b-3, such provision or award shall be construed or
deemed amended to conform to Rule 16b-3.
 
     (b) Any election by an Employee subject to Section 16 of the 1934 Act,
pursuant to paragraphs 6(c) or 15 hereof, may be made only during such times as
permitted by Rule 16b-3 and may be disapproved by the Committee at any time
after the election.
 
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